New-York tribune., 1905-08-16
YELLOW FEVER IMMUNITY
DR.. Doty Thinks 1t Usually Comes
from Disease Itself.

Or. A IT, Doty Health officer OF the Port OF
New-York. when discussing the much debated ques-
ton Of immunity from yellow fever yesterday. said
that there was difference OF opinion on the sub
iect. even among experts. lie pointed that
perma nent Immunity among natives in yellow fever
areas came rather from their being attacked By
the fever In infancy than from heredity. He said
also that the discovery Of maarial fever Organisms
by the French army surgeon. Laveran was sx-
eeedns.y valuable in establishing the difrerentlai
diagnosis between malariaI ard yellow fever. He
said
Some difference OF opinion exists even among
persons exposed to yellow fever. There is popular
ana Widespread belief that those who are born or
who Aave lived FOR long period where yellow
erdemic-aTe imnTns to tbis disease Yyhils this
is apparently the fact Is that neither OF these
conditions be depended on 70 confer immunity,
although they diminish the susceptibility 70 an at
When permanent immunity EXISTS a among s2 tH ne
II Is not so apt to be due to what - IssaroeG az
by an attack Of yellow fever in infancy child
hood. At this period the disease is very mild and
demic areas. Furthermore it has peen conciusively
shown that many natives as wei as, as u those who
endemic and who believed they were immune. have
1t is commonly understood that the colored race
enjoy Immunity This. however Is not a fact.
II, but the mortality IS very low In other words,
rule. they have it in mild form There are also
some persons who seem to have natural irnmun-
diseases. as they apparently remain with impunity
There is no doubt that this Is often due to an
attack of Infection disease in unrecOgnized form
contract infectious disease. even after they haTs
been many times in close proximity to i. So far
as yellow fever is concerned IL Is reasonable %
assume that the only permanent immunity Is o6-
cited ey almost all aut5orties wnere persons have
suffered from a second attack Still when thess
observation Of the same physician, or whoever re
ported Therefore. evidence
occurrence OF a previous attack depends largely
ea8no sh Be soseped as sassetory sat- scenSc sV
de3Se fgrthermore dengne; dissaSe %HIGa . y
malarial fever, sometimes bear a striking ressm-
than that IN the past and even at the present time
these diseases have been mistaken tor yellow Iever
tabshing the differential diagnosis between yellow
French army surgeon stationed in Algeria. discov-
cred the organism %afn % Is Ins Cause Ia ssTsfss o.
inasmueh as it places IN our nAGS G means MEANS ssS 9y Sn @
Although bacteriological research has thus far
examDaon Of the blood Of those who are held IN
organism. and therefore explain the elevation OF
tsPegasgrs f ste Ssa1S aRa fgTeS gTeeea AID IN sA1
IL Is for the reason, therefore. OF ascertaEing 4
persons with high temperatures or those who who
present suspicious SYMPTOMS are ire suIeI4s u srT en-
blood OF an sGsPfcts wo a6S rtie g sraT5
ing vessels al T i5sIS1~e eases TbirS have been
reported as yellow fever vessels arriving az
New-York particularly sailing vessels, where addt
tiona or secondary cases have occurred IN transit
the examination OF the blood has proven the pres
ence OF malarial fever. -,
AS a resume. il may be said that the immunity
Of natives residing in areas IN which yellow reEer
is endemic largely due 10 70 attack OF the dis
ease in infancy or childhood Ihls view Is sup
ported BY the fact that reliable evidence has been
presented TO show that natives who are believed
10 be immune sometimes contract yellow FEVER
Neither can a person who has lived IN an endemic
area for a number Of years, or person VINO lS ap
parentIv immune 10 other infectious diseases oe
REGARDED as protected inasTnuch as SATISFACTORY
prOOf has been presented to snow tlaJ Iney nave
also contracted yellow fever. on the otneF n4.l99
thOsa who are natives and those VINO nave, i've.
IN al endemic for long period are surely no.
SO susceptible as those who come nom SecoiiS uI
the world where the disease does ncL eSlsL - ~ -
instance person going from the northern part .
this country 10 a yellow fever area may oe re-
garded as particularly susceptible 70 U1e CiSeaSe
There is lttle doubt thar an attack OF NslioN
fever furnishes practically permanent immunity
10 the person affected. and that tba poSSloilly or
. second attack is exceedingly small, 50 rnuca 50
that il is not necessary 20 take y INTO consIera-
ton in establishing quarantine resllaIlors ahd
from a practical standpoint IT lS talr lo 9ssiltl-
that IL a person has yellow fever the report tha-
me said person has had prsvious attack or the
disease is open 70 doupf-
Dr.. Doty yesterday removed rom the MalorF
Line steamer Coneho. from Galveston. ten persons
with terlperatures above normal The patients
aecOnapanied bv sin friends who desired 20 oe ds-
tanned with them. we're sent to HOFFMAN lSlahte
where they will be hsld for examination