letters (correspondence)

Hanson informs Carter that he has settled in Jacksonville, Florida and has started his own practice. He discusses an alleged case of Weil's Disease in Guayaquil, Ecuador.

Hanson must decide whether to stay in private practice or resume yellow fever work with the International Health Board. Enclosing a telegram from Russell, he asks Carter if there is suspicion of yellow fever in Colombia.

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 reports on a yellow fever epidemic in Peru. The local newspaper is publishing articles denouncing his sanitary campaign.

Hanson writes about the vaccine being sent to Peru. He is concerned about funding.

Hanson reports on yellow fever work in Peru and comments on his employees, interpersonal issues, funding, and problems with steamship companies.

Hanson sends Carter a copy of a letter reporting on the yellow fever work in South America.

Hanson sends Carter a copy of Hanson's letter to Rose reporting on yellow fever work in Peru, and asks if Carter agrees that the situation seems nearly under control.

Hanson includes the names of medical personnel and the places he has inspected. He mentions the lack of cooperation from locals. He is considering a return to the U.S.

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 sends Carter a Spanish translation of a lecture. Some inspectors are returning to the Canal Zone. He hopes to bring his family to Peru. There has been an outbreak of bubonic plague. He offers his opinions on 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.