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ers agree that the incubation period of meningococcic meningitis is less than fourteen days. None of the 193 persons who received sulfanilamide as a prophylactic developed meningococcic meningitis while taking the drug. Two of the 193 developed meningococcic meningitis approximately one month after discontinuing the drug. The remaining 191 did not develop the disease.We can only estimate the rate of incidence in this epidemic because we know that not all cases that occurred were brought to our attention. The most accurate count that has been made for the areas concerned in the epidemic showed a population of 11,000. The physicians in the area know of ninety-two cases. This gives an approximate incidence of one case to 120 of population. This is a very high rate of incidence, since one case to 800 population is considered epidemic.2

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