﻿YELLOW 
  FEVER 
  — 
  SAWYER 
  

  

  581 
  

  

  Dr. 
  Henry 
  W. 
  Kumm 
  collected 
  70 
  blood 
  specimens 
  from 
  the 
  Guatuso 
  

   Indians. 
  They 
  inhabit 
  a 
  forested 
  region 
  about 
  equidistant 
  from 
  the 
  

   Atlantic 
  and 
  Pacific 
  Oceans 
  near 
  the 
  northern 
  frontier 
  of 
  Costa 
  

   Rict, 
  in 
  the 
  Province 
  of 
  Alajuela. 
  As 
  is 
  seen 
  in 
  table 
  1 
  the 
  protection 
  

   test 
  results 
  were 
  entirely 
  negative. 
  Dr. 
  Kumm 
  then 
  completed 
  the 
  

   study 
  by 
  investigating 
  10 
  districts 
  of 
  the 
  Talamanca 
  Valley 
  at 
  the 
  

   southeastern 
  end 
  of 
  the 
  Atlantic 
  slope 
  of 
  Costa 
  Rica. 
  The 
  number 
  of 
  

   specimens 
  collected 
  was 
  193 
  and 
  the 
  results 
  are 
  classified 
  by 
  age 
  groups 
  

   in 
  table 
  1. 
  The 
  persons 
  bled 
  had 
  never 
  been 
  out 
  of 
  the 
  area. 
  They 
  

  

  *** 
  

  

  COSTA 
  RICA 
  -CENTRAL 
  

  

  showing 
  the 
  forested 
  aveas 
  and 
  the 
  localities 
  

   Where 
  blood 
  specimens 
  -for 
  protection 
  tests 
  

   against 
  yellow 
  fetfev 
  virus 
  Were 
  obtained. 
  

  

  Forested 
  areas 
  

  

  Localities 
  Whete 
  specimens 
  Weve 
  _ 
  

  

  obtained 
  by 
  Dr. 
  Molloy 
  in 
  1932 
  and 
  1934. 
  . 
  .• 
  

  

  Localities 
  studied 
  in 
  1939 
  and 
  19A0 
  for 
  

   possible 
  presence 
  of 
  jangle 
  yelloW 
  fetfer...© 
  

  

  Figube 
  1. 
  — 
  Localities 
  in 
  Costa 
  Rica 
  where 
  yellow 
  fever 
  immunity 
  surveys 
  were 
  

   made 
  in 
  1932-34 
  and 
  1939^0. 
  

  

  were 
  mostly 
  American 
  Indians, 
  although 
  a 
  few 
  were 
  listed 
  as 
  mestizos 
  

   and 
  were 
  only 
  partly 
  of 
  Indian 
  blood. 
  The 
  blood 
  from 
  the 
  Tala- 
  

   manca 
  Indians 
  was 
  devoid 
  of 
  protective 
  power 
  against 
  yellow 
  fever. 
  

   The 
  new 
  evidence, 
  when 
  considered 
  in 
  relation 
  to 
  that 
  which 
  was 
  

   previously 
  collected, 
  strongly 
  suggests 
  that 
  yellow 
  fever 
  has 
  not 
  been 
  

   present 
  in 
  Costa 
  Rica 
  for 
  at 
  least 
  20 
  years 
  and 
  that 
  it 
  had 
  not 
  been 
  

   prevalent 
  among 
  the 
  Indians 
  of 
  the 
  forested 
  regions 
  of 
  the 
  interior 
  

   during 
  the 
  lives 
  of 
  the 
  present 
  inhabitants. 
  There 
  is 
  a 
  possibility 
  that 
  

   these 
  regions 
  were 
  never 
  involved. 
  The 
  conclusion 
  published 
  in 
  1937 
  

   that 
  yellow 
  fever 
  had 
  probably 
  not 
  been 
  present 
  in 
  Costa 
  Rica 
  since 
  

   the 
  epidemic 
  of 
  1910 
  seems 
  still 
  to 
  hold 
  good. 
  

  

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