Covid has enabled the spread of contagion theory.
n the US, people without children in their house typically spend a few weeks of the year infected with viruses; people with one child have an infection for about a third of the year; and those with two children will on average carry viruses more often than not.
Byington C.L. et al., ‘Community Surveillance of Respiratory Viruses Among Families in the Utah Better Identification of Germs-Longitudinal Viral Epidemiology (BIG-LoVE) Study’, Clinical Infectious Diseases, 2015.
“The red-blue divide in the US in the light of contagion/network studies”
There is a long-standing paradox in medicine: people who have a heart attack or stroke while surrounded by relatives take longer to get medical care. (Dhand A., ‘Social networks and risk of delayed hospital arrival after acute stroke’, Nature Communications, 2019)
Centola D., How Behavior Spreads: The Science of Complex Contagions (Princeton University Press, 2018).