The Genera Boophilus Rhipicephalus and Haemaphysalis (Ixodidae ...

Mountain spotted fever. Since this tick is found on dogs in
Rocky
with the proved vectors of this disease, it is hardly conceiv-
association
that R. sangieus has not already become a
transmitting agent
able
dogs. Fortunately this tick seldom bites man in this country. It
among
has already occurred in Mexico.
transmission
P. Regendanz and Julio Muniz (1935) in laboratory experiments
Drs.
guinea pigs were able to demonstrate stage-to-stage transmission in
on
sanguineus of "exanthematic typhus" of So Paulo, now known to be
R.
same as Rocky Mountain spotted fever.
the
a parasite, R. sanguineus is not only directly injurious to the dog
As
is a continual annoyance, calling for repeated removal of the ticks
but
treatment of kennels and other bedding places.
and
that are kept in dwellings or that have access to them, commonly
Dogs
infestations difficult to eradicate and,-in large cities, provide fre-
cause
jobs for the commercial pest exterminators.
quent
(1923) discovered Haemaphysalis l'eporis-palustris to be a
Parker
man, its passage of the disease from animal to animal is of
attacks
importance in the maintenance of the disease in nature.
primary
(1924) also showed that H. leporis-palustris is a natural vector
Parker
tularemia among rabbits and certain ground-frequenting birds in North
of
natural maintenance of tularemia.
the
Shillinger, and Green (1936) reported the transmission of
Larson,
papillomatosis by H. leporis-palustris in laboratory experiments.
rabbit
(1919) reported a fatal case of tick paralysis in a child (age 107)
Todd
attached to
head of the child.
the
Philip, and Davis (1932) have published data which suggest
Parker,
H. cinnabarina may be a transmitting agent of tularemia among
that
birds. If it is, this tick, too, is of possible significance
ground-frequenting
the incidence of tularemia in man resulting from contact with
in
birds.
game
4
does occasionally do so when dwellings are infested;
particularly when
of living are low, and there is a close association between dogs
standards
occupants. Under such conditions, occasional instances of the trans-
and
of Rocky Mountain spotted fever to man appear to be a
definite'
mission
possibility; in fact, there is evidence which suggests that such
future
natural vector of Rocky Mountain spotted fever.
While this tick rarely
It is possible that this tick is of considerable importance also .in
America.
due to a single Haemaphysalis cinnabarina (now chordeilis)