Comments by "Gergana Koleva" (@gerganakoleva4137) on "Measles: Understanding the most contagious preventable disease | About That" video.

  1. May be if you read the study you will know. He showed the paper - go and read. For example investigating, taking samples etc.. there are many ways to do that.
    3
  2.  @sandylross8710  Also in the older days there was no antibiotics, still many people survived bacterial infections. Those that did not were the weak anyway.😁
    1