![]() ![]() However, sometimes the WHO guesses wrong on which viruses will be active that year, or viruses mutate in the wild so that they are different from the ones in the flu shot. ![]() Currently, most vaccines are made by growing these viruses in fertilized chicken eggs, purifying the viruses and inactivating them. Some researchers suspect that the common practice of producing vaccines in chicken eggs could be partially to blame, according to an article in Chemical & Engineering News (C&EN), the weekly newsmagazine of the American Chemical Society.īefore each flu season, the World Health Organization (WHO) selects specific influenza viruses to include in that year's shot. The best prevention is a flu shot, but it's not unusual for these vaccines to be less effective than intended. (Editor) Jan 8 2020įlu season is underway in the Northern Hemisphere, sickening millions of people and in rare cases, causing hospitalization or death.
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