[contentcards url=”https://childrenshealthdefense.org/defender/whistleblower-biologist-pfizer-covered-up-exposure-engineered-virus-becky-mcclain/” target=”_blank”] By Brenda Baletti, Ph.D. Molecular biologist Becky McClain began raising safety concerns in 2000, soon after she started working in Pfizer’s Biosafety Level 2 lab…