A salmonella outbreak linked to yellow maradol papayas from a Mexican farm continues to sicken more people nationwide, and there has been an uptick of cases on Long Island, health officials said.

There were 173 cases nationwide as of Aug. 18, up from 141 the week before, and 109 when the outbreak was first reported in late July, according to the federal Centers for Disease Control and Prevention.

The number of cases on Long Island has increased to 15, from 10 in the previous recording period that ended Aug. 11, local health officials said Monday.

There are six cases in Suffolk, up from the original three cases, that county’s health department said.

There are nine cases in Nassau, up from eight cases reported originally, but one of those eight was later discounted after further testing revealed it was an unrelated strain, that county’s health department said.

There is a lag is entering local cases into the CDC database, so local numbers are not always reflected in the national numbers released weekly.

The CDC said four strains of salmonella — Kiambu, Thompson, Agona and Gaminara — were found in yellow maradol papayas imported under several brand names from a single farm in Mexico.

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Produce from that barn has been halted at the border, CDC said.

Almost one-half the 173 cases are concentrated in the metropolitan area with 36 cases, reported cases in New York City, according to the CDC and local officials.

Nonetheless, cases have been reported in 21 states, some as far away as Oklahoma and Wisconsin, according to the CDC.

The outbreak resulted in 58 hospitalizations nationwide and one death, in New York City.

The CDC said it hasn’t been able to collect complete information from all the victims, but it appears about 67 percent are Hispanic and about 60 percent are female.

Most people infected with the salmonella bacteria develop symptoms — including diarrhea, fever and abdominal cramps — within 12 to 72 hours of eating contaminated food, health officials say.

The illness usually lasts four to seven days and most people recover, health officials say.