(St. Louis, Missouri) Six weeks after someone with HIV said dozens of students at a St. Louis high school might have been exposed to the virus, it remains unclear whether an outbreak has occurred.

It isn’t clear whether those cases are even connected to Normandy High School, where students were tested voluntarily in late October. An infected person told county health officials that as many as 50 teens might have been exposed to the virus that causes AIDS.

The county plans a second round of HIV testing in January. Antibodies to the virus can take three to six months to appear. A final assessment isn’t expected for at least six months.