Table 1.

Epidemiological studies of the last five years from five world continents regarding Helicobacter pylori infection prevalence

Country	Ref.	Helicobacter pylori positivity	Test	Population
Southern Europe
Italy	Dore et al[1], 2012	13.3%	Serology	Children
Portugal	Bastos et al[2], 2013	84.2%	Serology	Adults
Northern Europe
Sweden	Thjodleifsson et al[3], 2007	11%	Serology	Adults
Norway	Bakkevold[4], 2010	51%	Serology	Adults
Eastern Europe
Czech Republic	Bureš[5], 2012	23.5%	Urea breath test	Combined data
Russia	Svarval’ et al[6], 2011	40.48%	Serology	Children-adolescents
America
United States	Patterson et al[7], 2012	17.1%	Serology	Adults
South America (combined data)	Porras et al[8], 2013	79.4%	Urea breath test	Adults
Asia
Saudi Arabia	Hanafi et al[9], 2013	28.3%	Serology	Children, adolescents
South Korea	Baik et al[10], 2012	55.7%	Serology	Adults
Africa
Nigeria	Etukudo et al[11], 2012	30.9%	Serology	Children
Morocco	Benajah et al[12], 2013	75.5%	Biopsy	Adults
Oceania
Australia	Pandeya et al[13], 2011	15.5%	Serology	Combined data
New Zealand	Fawcett et al[14], 2005	6.2%	Serology	Children, adolescents