Treaties and other international acts series. 2158. Health and sanitation, cooperative program in Uruguay, agreement between United States and Uruguay supplementing and extending agreement of Oct. 1 and Nov. 1, 1943, as modified and extended, effected by exchange of notes, signed Montevideo Nov. 10, 1947 and Jan. 3, 1948; entered into force Jan. 3, 1948, operative retroactively Jan. 1, 1948, and agreement between Government of Uruguay and Institute of Inter-American Affairs signed Montevideo Jan. 3, 1948.