QUOTE FOR MONDAY:

“National Immunization Awareness Month (NIAM) is an annual observance held in August to highlight the importance of vaccination for people of all ages”

Centers for Disease Control and Prevention (National Immunization Awareness Month (NIAM) | Vaccines & Immunizations | CDC)

“Vaccines work by stimulating the body’s immune system to safely provide protection against viruses or bacteria that cause infection. After vaccination, the immune system is prepared to respond quickly when the body encounters the disease-causing organism.”.

Federal and Drug Administration FDA (Approved Drug Products with Therapeutic Equivalence Evaluations | Orange Book | FDA)

National Immunization Awareness Month – Learn how the vaccines are done and types of vaccines!

National Immunization Awareness Month (NIAM) is an annual observance held in August to highlight the importance of vaccination for people of all ages. NIAM was established to encourage people of all ages to make sure they are up to date on the vaccines recommended for them. Communities have continued to use the month each year to raise awareness about the important role vaccines play in preventing serious, sometimes deadly, diseases.

Diseases that vaccines prevent can be dangerous, or even deadly if not prevented via a vaccine.  Understand ALL vaccines greatly reduce the risk of infection by working with
the body’s natural defenses to safely develop immunity to disease.
Also to understand how vaccines work, it is helpful to first look at how the body fights illness in more detail. When germs, such as bacteria or viruses, invade the body, they attack and multiply. This invasion is called an infection, and the infection is what causes the illness. The immune system uses several tools to fight infection. Blood contains red blood cells, for carrying oxygen to tissues and organs, and white blood cells or immune cells, for fighting infection. These white blood cells consist primarily of B-lymphocytes, T-lymphocytes, and macrophages:
In simpler terminlology this means building antibodies to the diseases or eating up the disease or fighting the disease that spread in the body but getting it under control (meaning killing it off).  So vaccines fight off and prevent infection from growing in the human body including in our dog or cat (Ex. rabies vaccine).
How is this done, well let us explain:
Macrophages-  are white blood cells that swallow up and digest
germs, plus dead or dying cells. The macrophages leave behind
parts of the invading germs called antigens. The body identifies
antigens as dangerous and stimulates the body to attack them.
Antibodies- attack the antigens left behind by the macrophages.
Antibodies are produced by defensive white blood cells called
B-lymphocytes.
•T-lymphocytes- are another type of defensive white blood cell. They attack cells in the body that have already been infected.
The first time the body encounters a germ, it can take several days to make and use all the germ-fighting tools needed to get over the infection. After the infection, the immune system remembers what it learned about how to protect the body against that disease.
The body keeps a few T-lymphocytes, called memory cells that go
into action quickly if the body encounters the same germ again. When the familiar antigens are detected, B-lymphocytes produce antibodies to attack them.
Vaccines help develop immunity by imitating an infection. This type of infection, however, does not cause illness, but it does cause the immune system to produce T-lymphocytes and antibodies. Sometimes, after getting a vaccine, the imitation infection can cause minor symptoms, such as fever. Such minor symptoms are normal and should be expected as the body builds immunity. Once the imitation infection goes away, the body is left with a supply of “memory” T-lymphocytes, as well as B-lymphocytes that will remember how to fight that disease in the future. However, it typically takes a few weeks for the body to produce T-lymphocytes and B-lymphocytes after vaccination.
Therefore, it is possible that a person who was infected with a disease just before or just after vaccination could develop symptoms and get a disease, because the vaccine has not had enough time to provide protection.

Types of Vaccines:

Scientists take many approaches to designing vaccines. These approaches are based on information about the germs (viruses or bacteria) the vaccine will prevent, such as how it infects cells and how the immune system responds to it. Practical considerations, such as regions of the world where the vaccine would be used, are also important because the strain of a virus and environmental conditions, such as temperature and risk of exposure, may be different in various parts of the world. The vaccine delivery options available may also differ geographically. Today there are five main types of vaccines that infants and young children commonly receive:
Live, attenuated vaccines fight viruses. These vaccines contain a version of the living virus that has been weakened so that it does not cause serious disease in people with healthy immune systems. Because live, attenuated vaccines are the closest thing to a natural infection, they are good teachers for the immune system.
Examples of live, attenuated vaccines include measles, mumps, and rubella vaccine (MMR) and varicella (chickenpox) vaccine. 
Inactivated vaccines also fight viruses. These vaccines are made by inactivating, or killing, the virus during the process of making the vaccine. The inactivated polio vaccine is an example of this type of vaccine. Inactivated vaccines produce immune responses in different ways than live, attenuated vaccines. Often, multiple doses are necessary to build up and/or maintain immunity.
•Toxoid vaccines prevent diseases caused by bacteria that produce
toxins (poisons) in the body. In the process of making these
vaccines, the toxins are weakened so they cannot cause illness.
Weakened toxins are called toxoids. When the immune system
receives a vaccine containing a toxoid, it learns how to fight off
the natural toxin. The DTaP vaccine contains diphtheria and
tetanus toxoids.
Subunit vaccines include only parts of the virus or bacteria, or subunits, instead of the entire germ. Because these vaccines contain only the essential antigens and not all the other molecules that make up the germ, side effects are less common. The pertussis (whooping cough) component of the DTaP vaccine is an example of a subunit vaccine.
Conjugate vaccines fight a different type of bacteria. These bacteria have antigens with an outer coating of sugar-like substances called polysaccharides. This type of coating disguises the antigen, making it hard for a young child’s immature immune system to recognize it and respond to it. Conjugate vaccines are effective for these types of bacteria because they connect (or conjugate) the polysaccharides to antigens that the immune system responds to very well. This linkage helps the immature immune system react to the coating and develop an immune response. An example of this type of vaccine is the Haemophilus influenzae type B (Hib) vaccine.
Vaccines that require more than one dose.
There are four reasons that babies—and even teens or adults for that
matter—who receive a vaccine for the first time may need more
than one dose or every year like the flu shot or every 5 years like pneumonia shot:
•For some vaccines (primarily inactivated vaccines), the first dose does not provide as much immunity as possible. So, more than one dose is needed to build more complete immunity. The vaccine that protects against the bacteria Hib, which causes meningitis, is a good example.
•In other cases, such as the DTaP vaccine, which protects against diphtheria, tetanus, and pertussis, the initial series of four shots that children receive as part of their infant immunizations helps them build immunity. After a while, however, that immunity begins to wear off. At that point, a “booster ” dose is needed to bring immunity levels back up. This booster dose is needed at 4 years through 6 years old for DTaP. Another booster against these diseases is needed at 11 years or 12 years of age. This booster for older children—and teens and adults, too—is called Tdap.
•For some vaccines (primarily live vaccines), studies have shown that more than one dose is needed for everyone to develop the best immune response. For example, after one dose of the MMR vaccine (Measles, Mumps, Rubella), some people may not develop enough antibodies to
fight off infection. The second dose helps make sure that almost everyone is protected.
•Finally, in the case of the flu vaccine, adults and children (older than 6 months) need to get a dose every year. Children 6 months through 8 years old who have never gotten the flu vaccine in the past or have only gotten one dose in past years need two doses the first year they are vaccinated against flu for best protection. Then, annual flu shots are needed because the disease-causing viruses may be different from year to year. Every year, the flu vaccine is designed to prevent the specific viruses that experts
predict will be circulating.
The Bottom Line Some people believe that naturally acquired immunity—immunity from having the disease itself—is better than the immunity provided by vaccines. However, natural infections can cause severe complications and be deadly. This is true even for diseases that most people consider mild, like chickenpox. It is impossible to predict who will get serious infections that may lead to hospitalization. Vaccines, like any medication, can cause side effects. The most common side effects are mild. However, many vaccine-preventable disease symptoms can be serious, or even deadly. Although many of these diseases are rare in this country, they do circulate around the world and can be brought into the U.S., putting unvaccinated children at risk.

Even with advances in health care, the diseases that vaccines prevent can still be very serious – and vaccination is the best way to prevent them!

QUOTE FOR THE WEEKEND:

“Amyotrophic lateral sclerosis (a-my-o-TROE-fik LAT-ur-ul skluh-ROE-sis) is a nervous system disease that affects nerve cells in the brain and spinal cord. Also known as ALS, the disease leads to muscle weakness and other symptoms that get worse over time.

ALS often begins with muscle twitching and weakness in an arm or leg, trouble swallowing, or slurred speech. Eventually ALS affects the muscles needed to move, speak, eat and breathe. There is no cure for this fatal disease, but research into new therapies is ongoing.”

MAYO CLINIC (Amyotrophic lateral sclerosis (ALS) – Symptoms and causes – Mayo Clinic)

ALS awareness – What is the Rx?

 

 

Over the past decade, understanding of the multiple destructive pathways that lead to neuronal death in amyotrophic lateral sclerosis (ALS) has greatly improved.  There is still no cure for ALS unfortunately with all the technology medicine has but there are therapies.

Home Care at some point in middle to beginning of late stage.

This would include a Home Health Assistant followed under a Visiting Nurse/RN with an Attending Doctor for follow up on the pt care=A whole team of medical care including as soon as needed:

PT and OT:

Physical therapy (PT) is the use of exercises and treatments to improve physical movement and overall mobility. Occupational therapy (OT) is similar but is focused on developing or maintaining the physical skills needed to perform everyday tasks. For example, a physical therapist might prescribe stretching exercises to limit discomfort and preserve range of motion or use pool therapy to help you walk and improve joint function. An occupational therapist may help you find new ways to brush your teeth or recommend equipment that can make your activities of daily living easier to perform.

Speech Therapy:

For people living with ALS with bulbar symptoms, ALS leads to speech problems when it attacks bulbar neurons. These are the nerve cells responsible for bringing messages from the lower parts of the brain (bulbar region) to the muscles that move the lips, tongue, soft palate (back of roof of mouth), jaw, and vocal folds (voice box). As nerves are lost to the disease, the muscles they control become weak and tight. This causes dysarthria-difficulty speaking).  A speech-language pathologist can help with both speaking and swallowing difficulties. This may include finding devices to help you communicate as your speech becomes harder for others to understand.

Respiratory Therapy:

A respiratory therapist can teach you new techniques for breathing and coughing, helping you keep your airway and lungs clear and healthy. When mechanical ventilators are needed, they can help you evaluate the options and choose the best ventilator for your needs.  An ALS diagnosis is shocking and frightening, but as with any disease, knowledge is power. Being aware of symptoms and how you can prepare for – and manage – them is key to quality of life and often, for peace of mind. The impact of ALS on breathing is one of the most daunting aspects of the disease and one for which you and your family can and should prepare for early in the ALS journey.

Psychotherapy:

Feeling sad or scared after being diagnosed with ALS is completely natural.

In time the patient with ALS has there life completed turned upside down when they need assistance with there activitities of daily living from independent in their ADLs.  It’s not unusual to feel depressed or anxious after getting diagnosed with ALS. If you have difficulty coping with the mental and emotional side of ALS, a counselor or psychiatrist can help.

Potential symptoms of depression include:  Prolonged feelings of sadness, hopelessness, worthlessness, anxiety, or guilt.   Irritability or angry outbursts over small matters. Changes in sleeping patterns, including insomnia or sleeping too much.  Changes in appetite.

Medications:

There are a number of medications that can help treat the various symptoms of ALS and new drugs are being developed all the time. Talk with your doctor or therapist to find out what is currently available and whether any such medications might be right for you.

There are currently four drugs approved by the U.S. Food and Drug Administration to treat ALS (Radicava, Rilutek, Tiglutik, and Nuedexta). Studies all over the world, many funded by The ALS Association, are ongoing to develop more treatments and a cure for ALS.

Radicava™ (edaravone)

The FDA approved Radicava™ in 2017, less than a year after Mitsubishi Tanabe Pharma America submitted a new drug application, making it the first new treatment specifically for ALS in 22 years.

Rilutek (riluzole, now generic)

This was the first FDA-approved drug available to treat ALS — in 1995. It inhibits glutamate release and prolongs life approximately three months. Riluzole is the generic name of Rilutek.

Tiglutik (thickened riluzole)

The first and only thickened liquid form of riluzole, Tiglutik was approved by the FDA in September 2018. This formulation contrasts with the oral pill form of riluzole that has been on the market for ALS for more than 20 years. It is designed to avoid potential problems of crushing tablets.

Nuedexta®

Indicated for the treatment of pseudobulbar affect (PBA), which is characterized by frequent, involuntary, and often sudden episodes of crying and/or laughing that are exaggerated and/or don’t match how you feel. PBA occurs secondary to a variety of otherwise unrelated neurologic conditions. Nuedexta® (dextromethorphan HBr and quinidine sulfate) was FDA-approved in 2011.

 

 

 

 

QUOTE FOR FRIDAY:

“Sciatica, the sharp, radiating pain that travels from the lower back down the leg, is one of the most common nerve-related conditions. Its lifetime incidence reaches up to 40%, it peaks in the 30s and 40s, and the large majority of cases resolve without surgery. Here is the 2026 data on how common sciatica is, what causes it, and how recovery works, from primary sources only.

  • Sciatica has a reported lifetime incidence of 10% to 40%.
  • The annual incidence is about 1% to 5%; disc-related sciatica affects ~2.2% yearly.
  • It accounts for roughly 5% to 10% of all low back pain cases.
  • Peak incidence is in the fourth decade (30s), most common ages 30–50.
  • The most common cause is a herniated lumbar disc pressing on a nerve root.
  • An estimated 80% to 90% improve without surgery.
  • About 30% still have troublesome symptoms at one year, showing why early care matters.”

Desert Spine and Pain (https://desertspineandpain.com/post/sciatica-statistics-2026)

Part II Sciatica Nerve Damage – the causes, the risk factors, and the complications!

Sciatica pain patterns, 1. Compression of the L4 nerve can result in pain radiating from the lower back down to the knee.
2. Compression of the S1 nerve can result in pain radiating down to the foot, MendMeShop TM ©2011

Causes

Risk factors

Risk factors for sciatica include:

  • Age. Age-related changes in the spine, such as herniated disks and bone spurs, are the most common causes of sciatica.
  • Obesity. By increasing the stress on your spine, excess body weight can contribute to the spinal changes that trigger sciatica.
  • Occupation. A job that requires you to twist your back, carry heavy loads or drive a motor vehicle for long periods might play a role in sciatica, but there’s no conclusive evidence of this link.
  • Prolonged sitting. People who sit for prolonged periods or have a sedentary lifestyle are more likely to develop sciatica than active people are.
  • Diabetes. This condition, which affects the way your body uses blood sugar, increases your risk of nerve damage.

Complications

Although most people recover fully from sciatica, often without treatment, sciatica can potentially cause permanent nerve damage. Seek immediate medical attention if you have:

  • Loss of feeling in the affected leg
  • Weakness in the affected leg
  • Loss of bowel or bladder function

QUOTE FOR THURSDAY:

“Sciatica is nerve pain from an injury or irritation to your sciatic nerve. In addition to pain, it can involve tingling or numbness in your back or butt that may radiate down your leg. You may also feel symptoms in your feet or toes.

There are two main types. No matter which type you have, the symptoms often feel the same. These include:

  • True sciatica: This type happens when an injury or condition directly affects the sciatic nerve.
  • Sciatica-like conditions: These conditions feel like sciatica but have other causes. They relate to nearby nerves or the group of nerves that form the sciatic nerve.

Healthcare providers often use the term “sciatica” for both types. The difference usually matters most when your provider recommends treatment.”

Cleveland Clinic (Sciatica: What It Is, Causes, Symptoms, Treatment & Pain Relief)

Part I Sciatica Nerve Damage – what it is, the symptoms, how its diagnosed, complications and how its treated!

sciatica 3 Sciatica2

Sciatica is pain, tingling, or numbness produced by an irritation of the nerve roots that lead to the sciatica nerve. The sciatic nerve is formed by the nerve roots coming out of the spinal cord into the lower back. It goes down through the buttock, then its branches extend down the back of the leg to the ankle and foot. When something presses on the sciatica nerve, like a herniated disc, it presses on that nerve which causes the pain from the buttock that can radiate all the way down to the foot. The intensity of the pressure on the nerve and where its pressed decides if it goes to the foot or less. Other causes of sciatica nerve damage:

The most common cause -a bulging or ruptured disc in the spine pressing against the nerve roots that lead to the sciatic nerve.

-Sciatica Nerve Damage can be a symptom of other conditions that affect

*Narrowing of the spinal canal due to spinal stenosis. This spinal canal narrowing pinches on the sciatica nerve.

*Bone spurs-they are growths that are small forming along joints caused by arthritis.

*Simply injury (like a car accident or fall) causing nerve root compression=again the same result-pinching the sciatica nerve.

*Pregnancy-not as common as a cause as the others listed.

*Rarely but also tumors could cause the problem also.

What are the symptoms?

Symptoms of sciatica include pain that begins in your back or buttock and moves down your leg and may move into your foot.

*Weakness, tingling, or numbness in the leg may also occur.

*At times a inconsistent stabbing feeling or pricking feeling in the ankle or foot

*Sitting, standing for a long time, and movements that cause the spine to flex (such asexercises using the knee to chest) which may make symptoms worse.

*Walking, lying down, and movements that extend the spine (such as press-ups) may relieve symptoms.

How is sciatica diagnosed?

Sciatica is diagnosed with a medical history and physical exam. Sometimes x-rays and other tests such as magnetic resonance imaging (MRI) are done to help find the cause of the sciatica.

What are the Complications?

Although most people recover fully from sciatica, often without any specific treatment, sciatica can potentially cause permanent nerve damage. Seek immediate medical attention if you experience:

-Loss of feeling in the affected leg  -Weakness in the affected leg

-Loss of bowel or bladder function

How is it treated?

In many cases, sciatica will improve and go away with time. Initial treatment usually focuses on medicines and exercises to relieve pain. You can help relieve pain by:

*Avoiding sitting (unless it is more comfortable than standing).

*Alternating lying down with short walks. Increase your walking distance as you are able to, without pain.  

* Takingacetaminophen (tylenol) or Motrin (Ibuporfen) or Advil or Aleve (Naproxen). All are nonsteroidal anti-inflammatory drugs which decrease the swelling of the inflammation around the area or injury to the back which will decrease the pain. More inflammation=more pinching on the nerve.

*Using a heating pad on a low or medium setting for 15 to 20 minutes every 2 or 3 hours. Try a warm shower in place of one session with the heating pad. You can also buy single-use heat wraps that last up to 8 hours. You can also try an ice pack for 10 to 15 minutes every 2 to 3 hours. There is not strong evidence that either heat or ice will help, but you can try them to see if they help you.

*Additional treatment for sciatica depends on what is causing the nerve irritation. If your symptoms do not improve, your doctor may suggest physical therapy, injections of medicines such as steroids, stronger medicines such as muscle relaxants or opiates.                                                                                                                                                

*Physical Therapy or chiropracter therapy or some form of therapy for 6 to 8 weeks.

* If the therapy is uneffective than the last resort in most cases is surgery that ranges from:

– laser surgery

– scrapping of the vertebrae pinching the nerve with leaving the rest of the vertebrae spacing the spinal cord in place or removing the vertebrae pinching the nerve and replacing it with cement (not cement we use for sidewalks that we know of).   It’s natural to want to return to your regular activities as soon as possible after surgery, but a lot depends on the type of operation you get.

 In two common methods, vertebroplasty and kyphoplasty, your surgeon makes a small cut in your back, which lets you recover faster. If you get spinal fusion surgery, the cut is larger, and it will take a longer time to heal.

 -small endoscopic surgery that is microsurgery removing pieces of the vertebraepinching which has a test called a discogram (injecting a dye right into the injured disc and than a ultrasound of the area is done to show the surgeon the exact route he has to follow to cure the problem. The surgeon numbs the area that he will repair with the pt wide awake; he makes a incision about 2/10 of an inch, using the cat scan as a guide for his eyes inserting a scope inserting a grabber that goes in the scope removing disc fragments that are pressing on the nerves causing the pain. It takes about 30 minutes for this procedure with only a small bandage covering the incision followed with the patient leaving the hospital in less than a few hours.                                                                                                                                                               *Other self-care treatments that may be helpful include:                                                                                                                                                -Cold packs. Initially, you may get relief from a cold pack placed on the painful area for up 20 minutes several times a day. Use an ice pack or a package of frozen peas wrapped in a clean towel.                                                                                                                                   

-Hot packs. After two to three days, apply heat to the areas that hurt. Use hot packs, a heat lamp or a heating pad on the lowest setting. If you continue to have pain, try alternating warm and cold packs.                                                                                                                                   -Stretching. Stretching exercises for your low back can help you feel better and may help    relieve nerve root compression. Avoid jerking, bouncing or twisting during the stretch and try to hold the stretch at least 30 seconds.     -Over-the-counter medications. Pain relievers such as ibuprofen (Advil, Motrin, others) and naproxen (Aleve) are sometimes helpful for sciatica.

References:

National Cancer Society

Web MD

Mayo Clinic

Dr. Bruce Hensel M.D. (chief medical editor channel 4)/Dr. David Ditsworth Surgeon – does back scoping -Robert Forrest Physical Therapy in Santa Monica, California.

QUOTE FOR WEDNESDAY:

“SAR is Severe Acute Respiratory Syndrome‑associated Coronavirus Disease.

Severe Acute Respiratory Syndrome (SARS) was a global disease outbreak in 2003 that was caused by a coronavirus called SARS-associated coronavirus (SARS-CoV). The illness was first reported in Asia in February 2003.

CDC worked with the World Health Organization in late February to investigate and confirm outbreaks of SARS in Southeast Asia.

The illness spread to 29 countries, where 8,096 people got SARS and 774 of them died. The SARS global outbreak was contained in July 2003.”

Center for Disease Control and Prevention – CDC (Severe Acute Respiratory Syndrome-associated Coronavirus Disease (SARS-CoV)| CDC)

 

Part II Sepsis & SARS/SIRS (Severe Acute Respiratory/Respiratory systemic inflammatory response syndrome)-Not new in hospitals.- know the symptoms, how its diagnosed and the treatment!

What are the symptoms of this condition?

  • Change in mental status.
  • Fast, shallow breathing.
  • Sweating for no clear reason.
  • Feeling lightheaded.
  • Shivering.
  • Symptoms specific to the type of infection, such as painful urination from a urinary tract infection or worsening cough from pneumonia.

Symptoms of sepsis are not specific. They can vary from person to person, and sepsis may appear differently in children than in adults.

Symptoms of septic shock

Sepsis may progress to septic shock. Septic shock is a severe drop in blood pressure. Progression to septic shock raises the risk of death. Symptoms of septic shock include:

  • Not being able to stand up.
  • Strong sleepiness or hard time staying awake.
  • Major change in mental status, such as extreme confusion.

How its Diagnosed:

Doctors often order several tests to try to pinpoint underlying infection.

Blood tests

Blood samples are used to test for:

  • Evidence of infection.
  • Blood-clotting problems.
  • Abnormal liver or kidney function.
  • Lower levels of oxygen than the body needs.
  • Electrolyte imbalances.

Other lab tests

Other lab tests to find the source of the infection might include samples of:

  • Urine.
  • Liquid from the wound.
  • Mucus and saliva from the respiratory tract.

Imaging tests

If the site of infection is not readily found, your health care provider may order more tests. Some examples of imaging tests are:

  • X-ray. X-rays can show infections in your lungs.
  • Ultrasound. This machine uses sound waves to produce real-time images on a video screen. Ultrasound can show infections in the gallbladder and kidneys.
  • Computerized tomography (CT). This machine takes X-rays from a variety of angles and combines them to show cross-sectional slices of the inside of the body. Infections in the liver, pancreas or other abdominal organs are easier to see on computed tomography (CT) scans.
  • Magnetic resonance imaging (MRI). This machine uses radio waves and a strong magnet to produce cross-sectional or 3D images. It may be helpful in seeing soft tissue or bone infections.

What is its treatment:

Early, thorough treatment raises the likelihood of recovery. People who have sepsis need close monitoring and treatment in a hospital intensive care unit. This is because people with sepsis may need lifesaving measures to stabilize breathing and heart action.

Medications

Different medications are used in treating sepsis and septic shock. They include:

  • Antibiotics. Treatment with antibiotics begins as soon as possible. Broad-spectrum antibiotics, which are effective against a variety of bacteria, are often used first. When blood tests results show which germ is causing the infection, the first antibiotic may get switched out for a second one. This second one targets the germ causing the infection.
  • Fluids added to veins. The use of intravenous fluids begins as soon as possible.
  • Vasopressors. Vasopressors narrow blood vessels and help increase blood pressure. A vasopressor medication may be used if blood pressure is too low even after receiving fluids.

Other medications may be used, such as insulin for blood sugar levels, or painkillers.

Supportive care

People who have sepsis often get supportive care that includes oxygen. Some people may need a machine help them breathe. If a person’s kidneys don’t work as well because of the infection, the person may need dialysis.

Surgery

Surgery may help to remove sources of infection, such as pus, infected tissues or dead tissues.