Yellow fever known as "mosquito inspectors" fiercely worked to combat yellow fever throughout Rio by spraying, exterminating rats, improving drainage, and destroying unsanitary housing. Ultimately, the city's sanitation and renovation campaigns reshaped Rio de Janeiro's neighborhoods. Its poor residents were pushed from city centers to Rio's suburbs, or to towns found in the outskirts of the city. In later years, Rio's most impoverished inhabitants would come to reside in "favelas". During 1920–23, the Rockefeller Foundation’s International Health Board undertook an expensive and successful yellow fever eradication campaign in Mexico. The IHB gained the respect of Mexico’s federal government because of the success.
History of yellow fever word of an epidemic would cause a quarantine to be placed on the city, and their trade would suffer. In such epidemics, steamboats frequently carried passengers and the disease upriver from New Orleans to other cities along the Mississippi River. The epidemic was dramatized and featured in the plot of the 1938 film "Jezebel", starring Bette Davis. Yellow fever was a threat in New Orleans and south Louisiana virtually every year, during the warmest months. Among the more prominent victims were: Spanish colonial Governor Manuel Gayoso de Lemos (1799); the first and second wives (d. 1804, 1809) of territorial Governor