Flying Fox Hemolytic Fever, Description of a New Zoonosis Caused by <i>Candidatus</i> Mycoplasma haemohominis
Élodie Descloux, Oleg Mediannikov, Ann-Claire Gourinat, Julien Colot, Martine Chauvet, Isabelle Mermoud, Denise Desoutter, Cécile Cazorla, Elise Klement-Frutos, Luca Antonini, Anthony Levasseur, Vincent Bossi, Bernard Davoust, A. Merlet, Marie-Amélie Goujart, Malik Oedin, Fabrice Brescia, Sylvie Laumond, Pierre‐Edouard Fournier, Didier Raoult
Abstract
BACKGROUND: Hemotropic mycoplasmas, previously classified in the genus Eperythrozoon, have been reported as causing human infections in Brazil, China, Japan, and Spain. METHODS: In 2017, we detected DNA from Candidatus Mycoplasma haemohominis in the blood of a Melanesian patient from New Caledonia presenting with febrile splenomegaly, weight loss, life-threatening autoimmune hemolytic anemia, and hemophagocytosis. The full genome of the bacterium was sequenced from a blood isolate. Subsequently, we retrospectively (2011-2017) and prospectively (2018-2019) tested patients who had been hospitalized with a similar clinico-biological picture. In addition, as these patients had been in contact with frugivorous bats (authorized under conditions for hunting and eating in New Caledonia), we investigated the role of these animals and their biting flies by testing them for hemotropic mycoplasmas. RESULTS: There were 15 patients found to be infected by this hemotropic mycoplasma. Among them, 4 (27%) died following splenectomy performed either for spontaneous spleen rupture or to cure refractory autoimmune hemolytic anemia. The bacterium was cultivated from the patient's blood. The full genome of the Neocaledonian Candidatus M. haemohominis strain differed from that of a recently identified Japanese strain. Of 40 tested Pteropus bats, 40% were positive; 100% of collected bat flies Cyclopodia horsfieldi (Nycteribiidae, Diptera) were positive. Human, bat, and dipteran strains were highly similar. CONCLUSIONS: The bacterium being widely distributed in bats, Candidatus M. haemohominis, should be regarded as a potential cause of severe infections in humans.