Ecto- and endoparasites have been reported to include trematodes, cestodes, nematodes, acanthocephalans, lice (Anoplura), fleas (Siphonaptera), Diptera, and ticks and mites (Acari).
In 1927 ill health forced him to leave the Museum and go to Australia and a drier climate, where he continued his Acari studies at the University of Adelaide.
The Afro-Peruvian population is concentrated mostly in coastal cities south of Lima, such as that of those found in the Ica Region, in cities like Cañete, Chincha, Ica, Nazca and Acarí in the border with the Arequipa Region.