| Show SPOTTED FEVER VACCINE MADE r ADE Montana and Idaho Sheep Handlers Tested Against Ti Tick k HELENA Mont Aug 16 Immunity from lick tick fever te or Mountain spotted fever has s ha been accomplished by experts o of the tho United States public health Dr and the tho Montana state board of ot It lt it is be- be be believed The Tho fever is cause caused 1 from the bite ot of o a woodtick After two years rB e ot of o operative co experimentation experimentation experimentation tion at nt Hamilton Mont In the Bitter Root noot valley alley where hero here cases heretofore have e been almost uni- uni uniformly uni uniformly fatal a 0 vaccine was de- de developed de developed last year Which through the tho results of ot Its use this season has I given elven great on en- en encouragement Coul to the men mn who hae courted death to cheat it ot of oIts Its prey prcy The serum scrum so far fiU de- de developed developed de developed Is not a cure but a preventative e Tho The period ot of Im- Im Immunity Im Immunity has not yet et been dc- dc Preliminary tests last year ear Indi Indi- Indicated Indicated the possibilities of or the Ilia se- se serum se serum rum Two men who had re- re re received ed cel but one fourth of ot tho the dos dos- dosage dosage dos ace age likely to give s-Ive I protection latH later contracted a a mild Infection and recovered These reco cries erles were wereth th the among seven Bitter BitterRoot BitterRoot BitterRoot Root valley alley cases eases during the sea sea- season season sea season son of ot 1 1025 ID n 2 5 and flero ero also aico the first two records of ot recoveries among laboratory and control workers several ot of whom have pal paid 1 with their lives for their do- do devotion de devotion to OX ON O hIllER This year two areas are ae select select- selected selected ed cd for tor tests with tho the small avail avail- available ablo able supply of vaccine In the valley valey ot of southern Idaho near r Shoshone where so high a 0 percentage of ot cases occurs among men sheep on the tho range men or about it 40 per percent percent cent ot of a SL selected elected group were vaccinated No cases ot of spotted fever In vaccinated per per- persons persons per persons sons In either cither area In the th Shoshone shone shone area there were eight cases In lathe the non-Immune non group These results are very cry sug- sug suggestive sus ot of o the th value of ot vaccination and indicate that full tun Immunity Is conferred says as a's Dr Ur R n It n But Dut Butler ler special expert In charge ot of othe the control work worl reporting to the federal health service and the state boar board 1 Tho The evidence how I ever is loss less decisive than tItan hoped for tor lr lie adds odds because the tho un- un unusually unusually un unusually usually low incidence of ot cases es cc especially es- es especially In the Shoshone area aren YE lt TO lUlU MAKI- As a IL result of ot th the tests ot of the tho two years the demand for tor sac ac vac vaccine cine the th doctor says Hays has grown to a point Impossible to meet with present facilities Production ot of the tho vaccine which Is mado from Infected adult ticks requires nearly a II full tull year It Involves the tho engorging ens ot of o hundreds ot of ticks the feeding reeding ot of thousands ot of the resultant larvae on Infected hosts and the rearing ot of these I through stapo to adults The progeny of ot each female must be roared reared to ad adults and later made Into vaccine as all distinct units and each tested for tor sterility and potency Further Investigations Dr Par Par- Parket Parket Par Par-ket ket explains should proceed along two main lines It Is to secure more mor comprehensive knowledge of ot th the habits habit ot of th arious the arlous animals which Inhabit the Bitter Ditter Root mountains mountain and nd their relative Importance as m hosts ot of the tho woodtick I Second it Is necessary sary sari to determine the exact part the rabbit tick plays In the nat nat- natural natural nat natural ural maintenance ot of Infection |
