Table 2.

Incidence of Paralytic Poliomyelitis in European and Native Moroccan Populations, Casablanca, Morocco, 1947–1953^a

	Cultural Background
	European	Moroccan
Total population	125,000	530,000
No. of paralytic poliomyelitis cases	117	25
Average annual attack rate per 100,000 population	13.4	0.7
Age group of patients from 1953, years
<2	8	9
2–9	15	2
10–39	5	0

^aData were obtained from Paul and Horstmann (32).