Columbia subject headings:
Communicable diseases--Nigeria.
Diseases--Seasonal variations--Nigeria.
Host-parasite relationships.
Medical climatology--Nigeria.
Medical geography--Africa.
Rain and rainfall--Nigeria--Periodicity.
Rain forests--Africa.
Schistosoma intercalatum.
Schistosomiasis--Africa.
Tropical medicine--Africa.
Harvard subject headings:
Diseases--Seasonal variations--Nigeria.
Schistosoma intercalatum.
Princeton subject headings: