In 1984, 10 children in the town of Promissao in Sao Paulo State, Brazil, developed a sudden and severe illness after a recent bout (within the last 30 days) of conjunctivitis – Brazilian Purpuric Fever (BPF). Scientists were able to isolate "H. influenzae" biogroup "aegyptius" after studying the blood and cerebrospinal fluids of affected children. After discovering another, and very similar, outbreak in Londrina (located a little under 200 miles from Promissao), scientists determined that a single "H. influenzae" biogroup "aegyptius" clone is responsible for all cases of BPF.