The sun. [volume] (New York [N.Y.]) 1833-1916, 1905-08-29
MILD YELLOW JACK EXPLAINED
SlOSOUITOEs TRANSMIT DISEASE
TO THEIR PROGENY.
q u % Attenuated ~ 70 BE Often Mis-.
taken Tor BreskbOne Fever. Says DIR.
Hava-Epidemic At NatcheZ Again
6tlrs Up the shotgun luarsntines.

Hava-Epl0emlc A. NotcneZ AGAIN
| Stir Up the shotgun guarantees.
New ORLEANS, Aug. 2s.-Dr. Audrian
Havs, who has made close study OF
yellow fever and the transmission Of the
djsease by the mosquito, announces that
thS paild type OF the disease which is most
oca.s.cnous at Patterson this year. but
which Shows itself in every epidemic, where
the diseSSe Ii 30 light as TO be frequently
mistaken for dengue (breakbone fever)
and the death rate Is less than 1 per cent,
" duo to infection by mosquitoes that are
not infected by Citing person sick Of the
yellow fever, but Ar> Matched from the eggs
pf such a mosquitox the infection being
carried TO the second generation. DR..
Hava has accepted the theory laid down
by the French yellow fever commission
which has been studying the disease in
Brazil for two year,, and which published
Its report only recently in Ppris. The
doctrine laid down by MIN Is al follows:
II female Stegomyd fasciota. or house
mosquito, feeds on yellow fever patient
during the first three or four days Of the
attack, it may transmit the yellow fever
to q non-immune after twelve days from
the date Of Its infection, and may continue
to inoculate the poison to non-immunes
during its natural life.
More than that, the eggs that 1t deposits
como forth infected, but with an attenu-
ated virus, which may produce in a non
immune mild type OF yellow FEWER,
Quitoes remain infected, as is the case
with the mother, as long as they live, and
the females during their whole existence
are capable Of communicating the poison
to non-immunes.
The male stegomyia originating from
IAN infected mother, though Matched in
4. fected cannot transmit the poison, nature
having denied to him the necessary organ
to feed on mankind; but as the female has
to perpetuate her species. nature has pro-
vided her with the means OF getting blood,
the most nutritious food obtainable, IN order
that her eggs may have all the constituents
necessary Tor the subsequent stages OF evo-
luton.
The severe cases Of yellow fever are
those arising from direct incubation by
poison from a patient to a non-immune.
The mild cases are the result of an inocula-
ton by a mosquito, in which the virus has
been attenuated through hereditary trans
mission, a mosquito Matched from an egg
deposited by an infected mother. AS the
infected female deposits eggs which are
infected and reproduces many mosquitoes
with the attenuated virus, we see more
cases Of mild than Of severe yellow fever.
Or. Hava concludes from that yellow
fever can be 30 attenuated In this way
Is to be without danger. 40 that troops or
laborers going from a high latitude into
the yellow fever zones may render them
solves immune and safe against the fever
by subjecting themselves to being bitten
by the progeny of the infected mosquito,
in which the yellow fever germ exists in
Q very modified or attenuated form. This
theory OF the French yellow fever COM
mission has not yet been accepted by the
United States Marine Hospital service or
American physicians, and has not been
demic will probably result in a test being
made.
The discovery Of yellow fever at Natchez.
Mrs, following so soon after similar
discovery at Gulfport, has produced bad
effect on guarantees. Both towns have
had tho most stringent OF guarantees,
Natchez declaring non-intercourse, and at
ono time refusing TO even handle the mail
for the Louisiana town Of Vidalia, opposite.
fever at home. The Investigation made
Matches since July 10. or nearly six weeks,
before Il was discovered and before the New
Orleans outbreak was known. The fact
that II was Of Q mild type and prevailed
mainly among negroes in poor section OF
the town kcpt 1t concealed SO long. Eleven
cases have already been brought to light
there, with number Of oonvalescents who
Natohez was the first town in Mississippi
TO declare shotgun quarantine against
the worst sufferers from yellow fever.
Five deaths and forty-five new cases
was the record to-day.