The fallacy of person-to-person transmission is ingrained in the population as news reports of vacationers trapped in China during a coronavirus are flown back to the US and are found to have COVID-19 corona virus that may spread to their family members. But COVID-19 is not spreading into the community. Online maps showing the almost stagnant number of coronavirus-confirmed cases in each State are rapidly vanishing from view on the internet.
There is person-to-person transmission of the virus, but not necessarily person-to-person transmission of the disease. To better explain this, we have to dig back into the annals of epidemiology (the study of disease).
A couple of decades ago it was epidemiologist Edgar Hope Simpson who asked some questions about the incongruities between published dogma about the spread of flu viruses and current epidemics that caused him to ask these questions: