Lyme disease is often considered an East Coast problem, but ticks in California also carry the bacteria, Borrelia burgdorferi, that causes the disease, if at lower rates—and late spring is when Californians are most likely to get infected. 

“It’s endemic in Marin for sure,” said Dan Salkeld, a professor at Colorado State University who researches ticks and Lyme. “We’re definitely in peak season right now.” 

Lyme disease can spur a rash, fevers, headaches and exhaustion.…