* Chinese health expert confirms virus can pass person-to-person * Fourth person dies from pneumonia in city of Wuhan * Authorities have so far confirmed at least 217 cases The Chinese official investigating a pneumonia outbreak stemming from a new coronavirus said the disease can spread from person to person but can be halted with increased vigilance, as authorities on Tuesday confirmed a fourth death. Zhong Nanshan said there was no danger of a repeat of the Severe Acute Respiratory Syndro