Armstrong – Table of Contents

manufacture of celluloid vaccination shields eliminated post-
vaccination tetanus. Armstrong also conducted experiments to suggest a
possible mechanism for the dangerous complication of encephalitis
following vaccination.
5) In 1927, he helped complete a compilation of milk-borne outbreaks of
diseases such as scarlet fever and undulant fever (brucellosis).
6) In 1929-1930, he isolated the agent of psittacosis (parrot fever)
demonstrating that it was a filterable, non-bacterial, virus-like
organism. He conducted laboratory and field work that provided the
data for an Executive Order issued by President Herbert Hoover in 1930
prohibiting the importation of psittacine birds into the United States
unless subjected to regulations then prescribed by the Secretary of the
Treasury.
7) In 1933, he led the effort along with others to isolate the previously
unknown virus that caused the epidemic of Saint Louis encephalitis. He
isolated the virus initially in monkeys and then in white mice.
8) In 1934, he isolated from brain material originating in the Saint Louis
encephalitis epidemic a new completely unknown virus that he labeled
“lymphocytic choriomeningitis” based on the unique location and
pathology of the infection’s involvement in the brain and meninges. He
continued the study of this agent for many years and contributed the
bulk of early information about its biology, epidemiology and behavior