Research on Conjoined Twins USSR. 1957 (contradicts to Germ theory)

Youtube has documentary in Russian, English subtitles Research on Conjoined Twins USSR. 1957 34:01 said that "at the age of three Masha gets sick with pneumonia, her body temperature rises 39 degree, while Dasha's temperature doesn't rise above 37. Dasha had no symptoms of disease...
Observations conducted on conjoined twins lead us to the conclusion that the process of disease develops under the dominating influence of the nervous system." (Twins had common blood circulation but separate nervous systems)Google: "Pneumonia is an infection in one or both lungs caused by bacteria, viruses, or fungi." According to www.healthline.com-- This statement doesn't match with old times' experiments and debunks infectious origin as asymptomatic theory.