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Vaccines have worked in the same way since they were invented more than 200 years ago. Since COVID-19 appeared, a new kind of vaccine has emerged -- the mRNA vaccine.
The travel landscape is fast changing, as a number of countries have imposed restrictions in the face of soaring cases. The Delta variant spreads person-to-person much more easily than previous versions of the virus.
There are concerns of a severe flu season ahead, based on the fact people may be more susceptible than normal. The reason is that we weren’t exposed to flu viruses last season, and immunity wanes over time.
If it seems like warm-weather colds are on the rise this year, they are. Cold viruses have been circulating more than normal this time of year as people shed face masks and attend social gatherings.
The fast-spreading COVID-19 mutation known as the Delta variant has gained a foothold in the United States. The new variant renews concerns about how to keep children safe, especially with another school year around the corner.
Vaccines are particularly important for older adults. Risks to certain diseases are higher for this age group since it can be more difficult to fight off infections as your immune system naturally weakens as you get older.
You may have heard misgivings from a friend or relative about COVID-19 vaccines that focus on reproductive health issues. In this Q and A, an OB-GYN explains there is no science to support these misgivings.
Medical researchers are just beginning to understand the long-term effects of COVID-19. Evidence is showing that even people with mild symptoms of COVID-19 may suffer health problems for weeks or months afterward.