letters (correspondence)

Hanson discusses ways of converting funds into dollars. He reports on field work done by various experts. He mentions funding issues concerning the Peruvian government.

Hanson discusses a yellow fever outbreak in Trujillo. He mentions the difficulty of doing prophylactic work in Lima. He offers his opinions regarding a member of the Panama Canal Health Department and the Peruvian government.

Hanson hopes that there will be no more yellow fever cases after the year 1921. He describes his field work in detail: the use of fish to combat mosquito breeding was very successful but the limited use of containers was difficult to enforce. He praises several inspectors for their good work.

Hanson reports on the investigation of a possible yellow fever case. He describes his field work and discusses personnel matters. He hopes to bring the campaign to an end by the spring of 1922.

Hanson refutes Dr. Arces' theory that yellow fever does not exist in Peru. He expresses confidence in the work being done.

Hanson requests a copy of Carter's article on the incubation period of yellow fever, from 1900.

Hanson details his yellow fever work in Peru, commenting on his workers, areas of the country where mosquito work is being done, the suspension of Dunn's stegomyia work, and fever cases.

Hanson details the progress against yellow fever in Peru, but notes that the situation in Mexico and Central America is more serious than once thought.

Hanson believes that the yellow fever epidemic along the Peruvian coast has been contained.

Hanson reports on mosquito larvae studies in Peru. He also discusses, at length, administrative and political issues related to his work.

Hanson writes that he has announced to the press and government that yellow fever has been eradicated along the coast.

Hanson discusses the political situation in Peru and his difficulties in dealing with local authorities.

Hanson informs Carter that he plans to go to Africa to fight yellow fever.

Hanson writes that he doubts there is yellow fever in Colombia. He discusses the differences between his private practice and working for the public health service.

Hanson approves of Carter's paper concerning yellow fever in Australia and Asia. Hanson offers his opinion on the world-wide campaign against yellow fever.

Hanson reports on yellow fever in Colombia. He also discusses financial matters.

Hansen writes about his work in Colombia. He has seen no yellow fever in Bucaramanga, although the Stegomyia index is high there as well as along the Magdelena River. He discusses other diseases he has encountered there and notes Dunn's work with mosquitoes.

Hanson describes the ongoing yellow fever work in Colombia. He believes an outbreak is still possible, although there have been no confirmed cases. There has been extensive dengue fever in Barranquilla.

Hanson writes about his search for new work and his discouragement at not being offered public health positions. He notes that sanitary work in Peru has almost stopped due to financial issues.

Hanson discusses yellow fever cases in Peru.