The number of cases of phlyctenulosis in the United States has been rapidly decreasing since the World War. Redding1 demonstrated this by diagrams showing the incidence of phlyctenular keratitis and conjunctivitis at the New York Eye and. Ear Infirmary and at the Wills Hospital in Philadelphia. Similar statistics from Vienna had not shown a parallel decrease.
The annual average number of patients, both adults and children, in whose cases a diagnosis of phlyctenular disease was made at the Massachusetts Eye and Ear Infirmary is presented for five year periods from 1910 to 1934, and for the past two years, in table 1. The average annual number of cases observed in 1935 and 1936 was but 7.5 per cent of the annual number in the period from 1910 to 1914 and but 10 per cent of that in the period from 1915 to 1919. Statistics gathered by the state board