Rosamund Lewis said it was critical to emphasize that the vast majority of cases being seen in dozens of countries globally are in gay, bisexual or men who have sex with men, so that scientists can further study the issue and for those at risk to be careful. LONDON (AP) - The World Health Organization’s top monkeypox expert said she doesn’t expect the hundreds of cases reported to date to turn into another pandemic, but acknowledged there are still many unknowns about the disease, including how exactly it’s spreading and whether the suspension of mass smallpox immunization decades ago may somehow be speeding its transmission.