- Armstrong, C.: Postvaccination encephalitis with special emphasis reference to
 prevention. Public Health Reports 47: 1553-1568, July 22, 1932.
- There was little available in the medical literature about the pathogenesis of the
 encephalitis following smallpox vaccination at the time this manuscript was
 written. Other authors have speculated about an “immunologic” mechanism as the
 cause of this complication.
- Rivers, Ibid. Pp.52-53.
- Frost, W. H. quoted by Armstrong with respect to the 1916 poliomyelitis
 epidemic in New York City.
                    
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