Vaccines
How COVID-19 Expanded Substance Abuse
Learn more about how COVID-19 increased drug abuse and the relationship between drug use and the pandemic.
BCG Vaccine Impact on TB Testing
Tuberculosis has been stalking humankind for hundreds of years, and has been quite deadly until very recently. A vaccine developed in the early part of the last century, known as the BCG vaccine, is still given to people in many countries. In the USA, where PPD testing is a common diagnostic tool to determine if someone has active TB, a history of BCG vaccination may complicate matters.
