Or they may have no role in transmission at all.
When you have problems that weren't solved by the easy answers - look harder.
Study. Test. Find out. Communicate.
|Knowing the full story of how a virus spreads is hard work. But transmission is not necessarily a simple process. Like everything biological, it may be more complex than we care to acknowledge. Such a complex scenario is shown here. Completely fictitious.|
Or maybe not.
Testing can answer questions. Communication can provide answers.Click on image to enlarge.