Cdc live virus vaccines

The eggs have to be especially pure, bred specially on special farms. Those chickens are under cover so that wild birds can't get at them and infect them," says Dr. There's also a more modern way of producing vaccines, by growing them in animal cells in very large test tubes, as the CDC points out.

But whichever way the virus is grown, it's produced in very large amounts and then extracted from the eggs or cells. There are special versions of the flu vaccine for people age 65 and up.

These contain the same inactivated virus as the standard dose vaccine. One version of the vaccine for seniors is high-dose, and it contains four times the dead virus as the regular shot. Another version has the same amount of antigen, but also has an ingredient called an adjuvant which help spur the immune system to mount a stronger response.

Neither of these vaccines is capable of causing an influenza infection. Here's What Experts Say. There is one kind of flu vaccine that does contain a live—but weakened—virus. That's the nasal mist, which is available for non-pregnant people age 2 to 49 with no serious underlying health conditions. For this vaccine, the CDC explains that the viruses are first grown in eggs just as they are for the injection.

But then instead of being killed, the viruses go through a different production process that weakens them. According to the CDC , "The weakened-viruses are cold-adapted, which means they are designed to only multiply at the cooler temperatures found within the nose, and not the lungs or other areas where warmer temperatures exist. The viruses are incapable of multiplying at that temperature, so they can't produce influenza at all.

Did you know that scientists are still working to create new types of vaccines? Here are 2 exciting examples:. Getting vaccinated is easy. See how vaccines are developed, approved, and monitored. Suite L Washington, D. A-Z Index. Vaccine Types. When scientists create vaccines, they consider: How your immune system responds to the germ Who needs to be vaccinated against the germ The best technology or approach to create the vaccine Based on a number of these factors, scientists decide which type of vaccine they will make.

There are several types of vaccines, including: Inactivated vaccines Live-attenuated vaccines Messenger RNA mRNA vaccines Subunit, recombinant, polysaccharide, and conjugate vaccines Toxoid vaccines Viral vector vaccines Inactivated vaccines Inactivated vaccines use the killed version of the germ that causes a disease.

Inactivated vaccines are used to protect against: Hepatitis A Flu shot only Polio shot only Rabies Live-attenuated vaccines Live vaccines use a weakened or attenuated form of the germ that causes a disease. But live vaccines also have some limitations. These vaccines are used to protect against: Hib Haemophilus influenzae type b disease Hepatitis B HPV Human papillomavirus Whooping cough part of the DTaP combined vaccine Pneumococcal disease Meningococcal disease Shingles Toxoid vaccines Toxoid vaccines use a toxin harmful product made by the germ that causes a disease.

Toxoid vaccines are used to protect against: Diphtheria Tetanus Viral vector vaccines For decades, scientists studied viral vector vaccines. The future of vaccines Did you know that scientists are still working to create new types of vaccines? In an average year, thousands of people in the United States die from flu , and many more are hospitalized. Flu vaccine prevents millions of illnesses and flu-related visits to the doctor each year. CDC recommends everyone 6 months and older get vaccinated every flu season.

Children 6 months through 8 years of age may need 2 doses during a single flu season. Everyone else needs only 1 dose each flu season. There are many flu viruses, and they are always changing. Each year a new flu vaccine is made to protect against the influenza viruses believed to be likely to cause disease in the upcoming flu season. In some cases, your health care provider may decide to postpone influenza vaccination until a future visit. For some patients, a different type of influenza vaccine inactivated or recombinant influenza vaccine might be more appropriate than live, attenuated influenza vaccine.

People with minor illnesses, such as a cold, may be vaccinated. People who are moderately or severely ill should usually wait until they recover before getting influenza vaccine. As with any medicine, there is a very remote chance of a vaccine causing a severe allergic reaction, other serious injury, or death. An allergic reaction could occur after the vaccinated person leaves the clinic.

If you see signs of a severe allergic reaction hives, swelling of the face and throat, difficulty breathing, a fast heartbeat, dizziness, or weakness , call and get the person to the nearest hospital. Your health care provider will usually file this report, or you can do it yourself.

Claims regarding alleged injury or death due to vaccination have a time limit for filing, which may be as short as two years. Visit the VICP website external icon or call to learn about the program and about filing a claim.

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