Such a reaction typically starts within minutes of a shot, is unlikely to occur after 60 minutes, and is highly unlikely after four hours, according to two physicians at McMaster University in Hamilton, Ontario.
Fever, local pain and swelling can occur up to 21 days after a vaccination and are not signs of allergy, according to Dr. Derek Chu, a fellow in clinical immunology and allergy, and Dr. Zainab Abdurrahman, an assistant clinical professor in pediatrics.
No special precaution is needed when people with an egg allergy get a shot for flu; measles, mumps and rubella; or rabies — even though those vaccines may contain a tiny amount of egg protein, the Public Health Agency of Canada and the Canadian Pediatric Society said.
The paper was published April 8 in the Canadian Medical Association Journal.
— Robert Preidt
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SOURCE: McMaster University, news release, April 8, 2019