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In November 2021 the CDC announced that several frozen vials labeled "Smallpox" were discovered in a freezer in a Merck & Co. vaccine research facility at Montgomery County, Pennsylvania. [18] [19] [20] The vials were determined to contain the vaccinia virus, used in making the vaccine, not the variola virus, which causes smallpox. [21]
Many combination units cool the refrigerator using air from the freezer, resulting in different temperature zones inside the fridge. [7] Placing vaccines near the cold air output from the freezer could cause too low temperature, and placing it at the very bottom could cause too high temperature.
Vaccines are also compromised through improper use of the door gasket to feed cables from data loggers and thermometers, allowing excess warm air in, and cold air out of the refrigerator or freezer. Over time this causes the compressor to work a longer duty cycle and eventually leads to failure.
If a person infected with the Ebola virus rides the subway and has a body fluid (such as mucus from sneezing) on his or her hand, and then touches the railing on a subway, the virus can live up to ...
This process, developed by the New York Blood Center, [9] is the most widely used viral inactivation method to date. It is predominantly used in the blood plasma industry, by over 50 organizations worldwide and by the American Red Cross. This process is only effective for viruses enveloped in a lipid coat, however. The detergents used in this ...
Avian flu virus can last indefinitely at a temperature dozens of degrees below freezing, as is found in the northernmost areas that migratory birds frequent. [citation needed] Heat kills H5N1 (i.e. inactivates the virus). Influenza A viruses can survive: Over 30 days at 0 °C (32.0 °F) (over one month at freezing temperature)
The process of serial passage yields a live vaccine. There are both advantages and disadvantages to this. Most notably, live vaccines are sometimes more effective and more long-lasting than inactivated or other types of vaccines. [10] [11] However, just as the virus evolved to become attenuated, it may reverse-evolve in the host, leading to ...
There are different types of viruses that people can catch in the state this winter: COVID, influenza and RSV. RSV is a common respiratory virus that causes runny nose and sneezing, and can be ...