TABLE 3—
Endemic Yellow Fever Areas Before World War II
| Region/Sera Types | Year of Last Epidemic |
| Sera with yellow fever immunity (as tested by intraperitoneal protection test in mice) in any age group | |
| Mexico: 1089 sera: 9% of sera of those aged 10–14 y, 29% of those aged 15–19 y, and 43% of those aged > 20 y positive. | 1921 |
| West Indies, Cuba: 1177 sera: all those from persons aged < 20 y negative; 8.4% of those aged > 20 y showed immunity. | Barbados 1916, Cuba 1908, Jamaica 1905, Puerto Rico 1900, Trinidad 1914 |
| Central America: 1182 sera: 7% of sera of those aged 15–19 y and 29% of sera of those aged > 20 y positive. | El Salvador 1924, Guatemala 1924, British Honduras 1924, Honduras 1921, Nicaragua 1919 |
| From Senegal 3300 miles to upper reaches of White Nile in Sudan and southwards to northern Angola and Belgian Congo (16 degrees north to 6 degrees south). | |
| Sera with no yellow fever immunity in any age group | |
| Italy, Spain, Portugal, Canada, United States | Italy 1820, Spain 1890, US 1899 |
| Australia, Ceylon, China, Java, India,a Malaya, Philippines, Syria | |
| Morocco, Algeria, Tunisia, Egypt,b Ethiopia, British Somaliland, Southern Rhodesia, Bechuanaland, Union of South Africa, Kenya,c Madagascar, Tanganyika,d Zanzibar |
a
Two adults aged > 20 y in 1 city (Chingleput) showed immunity.
b
Two adults in Assyut showed immunity.
c
One person in Kisii showed immunity.
d
One person in Mwanza showed immunity.
Source. Sawyer et al.55,56 Data not published for Latin America.