SOUTH BRUNSWICK, N.J. (CBSNewYork) – Three students passed out in class at South Brunswick High School Monday morning, officials said.

The school’s superintendent says the teacher was doing a presentation on blood and HIV.

Fire officials there told CBS2 two of the teens fainted due to the nature of the lesson. The third teen passed out after seeing the other two faint, which officials told CBS2 is not uncommon among youth.

In addition to three teens passing out, seven others felt nauseous, officials said.

The incident took place at around 10:30 a.m.

The school was briefly evacuated and air testing conducted before students were allowed to return to the school.

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