Some vaccines protect for life. Why don’t Covid-19 vaccines do this?
[ad_1] Measles vaccines protect for life, chickenpox vaccinations – from 10 to 20 years, and tetanus vaccine – a decade or more. Why the Covid-19 amp is needed six months after the initial vaccination tries to explain an article in the Wall Street Journal. “A really good vaccine keeps people from getting infected, even when … Read more