NEW YORK (AP) — Studies have begun to emerge that try to determine how many Americans have been infected by the new coronavirus. But are they accurate?

The results depend on where and how the research is done, and it can be difficult to draw firm conclusions from the early findings, experts said.

For instance, a study in New York state, one of the nation's most infected, estimated that the true number of infections is about 10 times the official count. In Santa Clara County, California, which includes San Jose, research indicated infections were at least 50 times greater. And in Los Angeles Co...