The mayor of a U.S. city in the state of New Jersey claims he recently tested positive for COVID-19 antibodies and believes he was infected by the virus in November, about two months before the first confirmed case in the country.

Mayor Michael Melham reportedly said he had high fever, chills and hallucinations.

However, amid the coronavirus virus pandemic, questions have been raised about the reliability of antibody tests and the ability to pinpoint the exact time of infection. And it's not clear whether anyone else who had contact with the mayor contracted the virus.

New Jersey has been hit hard by COVID-19, with more than 130,000 cases and 8,500 deaths.