Dr. Colm Henry:

There are no reports in this country. There have been individual reports - one, I think, in The Lancet- on a patient in Nepal. It was 28-year-old man who was reinfected. A typing of the virus demonstrated it was a true reinfection, with the second infection being more severe. That raised some concerns as to the sustainability of immunity once somebody has been infected, but, to my knowledge, we have not had a report of reinfection. That is not to say it has not happened but it has not been reported.