COVID is heating up this summer. Should we wear masks again?

The uptick in coronavirus transmission this summer has not brought major alarm from health experts.

But it is raising questions about whether the risks are high enough to go back to safety measures that many have abandoned.

Dr. Peter Chin-Hong, a UC San Francisco infectious diseases expert, said transmission is increasing and “we haven’t seen the crest yet” of the wave.

But swearing off masks for good — even when sitting on a plane next to someone who is coughing or sneezing — would unnecessarily put people at higher risk for illness.

“I think there’s, like,…