Tag: herd immunity

Natural immunity to Covid-19 can last for years according to a recent study.

Natural immunity to Covid-19 can last for years according to a recent study. So, you’ve had covid-19 a few months ago and now a vaccine is available.   If you had Covid-19 a few months back, do you need the vaccine as well? There has been a lot of discussion about this since the antibodies may only be present for 3-6 months.   Once you have natural immunity, it should last for years, well past the time when the antibodies go away. This is because the body’s T cells will continue to recognize and protect us for years afterward.    T cells Read More »

Are we almost at Herd Immunity for Covid19? This is what scientists now believe.

Are we almost at Herd Immunity for Covid19? This is what scientists now believe. Herd Immunity means you have reached a level that protects most of us from becoming ill from a virus or other infective agents. Currently, researchers have in the past believed you must achieve immunity levels of 70% for the population to be immune. More than a dozen scientists are now rethinking this age-old idea.  There is a growing belief that Herd Immunity can be achieved at only 50% of the population developing resistance to the infective agent. In the case of covid19, we must look at Read More »