Equine encephalitis in Massachusetts.

This research focuses on the first recognized human infection of equine encephalomyelitis, a disease mostly found in horses, which occurred in Massachusetts in the summer of 1938. The study dives into the early epidemiological investigations that led to this discovery.

Article Overview

The paper provides an overview of equine encephalomyelitis, its history and the events leading to the identification of the first identified human infection. The initial viral work was done by three researchers, Fothergill, Dingle, and Connerley, who used material from fatal cases provided by another researcher, Feemster. Feemster was conducting an epidemiological investigation at the time.

Background and History

• Equine encephalomyelitis is an infectious disease primarily found in horses, but it can also affect humans.
• Three distinct versions of this virus have been previously identified: the western version by Meyer, Haring, and Howitt in 1930, the eastern version by Ten Broeck and his associates in 1933, and the Venezuelan version.

The Discovery in Massachusetts

• The first known human infection with one of these equine encephalomyelitis viruses was recognized in Massachusetts in 1938. What makes this finding particularly significant is that until this time, these viruses were thought to primarily afflict horses. The discovery that humans could also contract the virus marked a turning point in how the disease was viewed and approached.
• Researchers Fothergill, Dingle, and Connerley collaborated on the research on this initial case, using samples from fatal cases provided by Feemster, who was conducting an epidemiological investigation.
• Feemster’s work was fundamental in identifying the first human infection with equine encephalomyelitis, illustrating the vital importance of in-depth epidemiological investigations in identifying and understanding new and emerging diseases.

Further Research and Implications

• Following this discovery, additional research was conducted to better understand the disease’s increasing threat to humans.
• While the paper does not delve into the specifics of this further research, it sets the stage for an important exploration into the nature of this zoonotic disease.
• The findings likely had far-reaching implications not only for how to treat and prevent the disease in both horses and humans but also for how other zoonotic diseases might be studied and understood.