MIT Medical (Stress and isolation due to measures impact immunity)
“…But that doesn’t mean social distancing will have no effect on your immune system. The psychological effects of social isolation can affect your immune system. The culprits are loneliness and stress.
Research shows that our anti-viral response is suppressed when we feel lonely. An analysis of 148 different studiesinvolving more than 300,000 people found that people who were more socially connected were 50 percent less likely to die over a given period. One experiment even found that people with many social ties are less susceptible to the common cold.”
(additional links to NLM and Genome Biology).