New York ( CNN ) -- Three people who contracted cholera at a wedding in the Dominican Republic before returning to New York have recovered , and the risk of their infecting anyone else is low , officials said Sunday . None of the three adults had to be hospitalized , said Erin Hughes , spokeswoman for New York City 's health department . Person-to-person transmission of the disease is highly unlikely , Hughes told CNN in an e-mail . `` Cholera is spread by drinking water or eating food contaminated with the cholera bacteria . This happens in places with inadequate water treatment and poor sanitation . New York City 's water is clean and safe . '' On average , one case a year of cholera is reported in New York , she said , and it is `` almost always in someone who has traveled abroad . '' The Centers for Disease Control will test samples to confirm the illness and determine from which strain the people were sickened , said CDC spokeswoman Candice Burns Hoffman . Cholera is a `` nationally notifiable '' disease , she said , and samples from all suspected U.S. cases are sent to the CDC for lab testing and confirmation . The Dominican Republic is investigating the outbreak at the wedding , Hoffman said . `` It 's not uncommon for cholera outbreaks , like the one that has moved rapidly through Haiti , to spread to other countries , '' Hoffman said . `` We have seen a few cases in travelers returning to the U.S . The risk for secondary infection in the U.S. is low . ''
The 3 men were guests at a hotel in the Dominican Republic . They did not have to be infected , according to New York 's Health Department . The risk of secondary infection is low , officials say .