Table 5: Prevalence of Helicobacter pylori in different studies.

Country cityPeriod (year)Number of participantsMean age–years (range)Methods to diagnoses HpLocal hospital-based/community-basedPrevalence of Hp (%)Ref.

Brazil
São José Rio Preto2009/ 2012240647.5 ± 16.1UreasePublic hospital35.4Current study
15.2 ± 2.324.7
São Paulo3266.82 ± 4.07SerologicalSão Paulo Hospital35.615
São Paulo20041406<10 to >60Urease9 of July hospital19.320
2014113014.1
Belo Horizonte2007 to 201131110.7 ± 3.3 (3 to 16)Culture/urease/carbolfuchsin37.623
Santiago/Chile31.4
London/UK7.4
Salvador1997 to 2003, 200511046.8 ± 0.5 (4 to 11)SerologicalCommunity28.721
Fortaleza2000 to 20016101 to 8013C-urea breath testCommunity62.914
Africa
Ghana2014 to 201524010.5 ± 2.7 (5 to 16)Immunochromatographic assay (fecal)Rural community14.225
Taiwan
Lanyu Island200879645 ± 13.2 (12 to 89)13C-urea breath testCommunity72.119
Japan
7 geographic areas1997 to 201311,470Serological/urinary or stoolHealth center/clinic37.6/women 43.2/ men26
Canada
Aklavik200819440.3 ± 17.1 (10 to 80)Histology (Giemsa)Community6628
USA
Population study1988 to 1994746520 to 70SerologicalCommunity32.511

 = data not available; Hp = Helicobacter pylori.