The service told the Russian news agency RIA Novosti that the workers were taken by ambulances to St. Petersburg's Botkin Clinical Infectious Diseases Hospital after becoming ill.
A source in the city prosecutor's office said they suspect the food poisoning was caused by tainted chicken.
The workers were employed in the construction of a new terminal at St. Petersburg's Pulkovo airport.
2014: The Year in Fashion [PHOTOS]
U.S., allies launch airstrikes against Syria