In an editorial today, the New England Journal of Medicine urges mandatory reporting of HIV infections to state health departments so more people will get early treatment. More than half of all states now require that the names of infected people be reported to confidential registries. But New York and California, the two with the most cases by far, do not. Minnesota was second in the nation to require mandatory reporting. It did so in early 1986, and Doctor Keith Henry, an AIDS specialist at Saint Paul Ramsey Medical Center, says we've been reaping the benefits.