Four closure orders were served on food businesses last month, including three eateries in Roscommon.
The Food Safety Authority of Ireland (FSAI) confirmed that the Honeybear ice cream van operating on Shore Front, Buncrana, Donegal, was also closed down by health officials over fears of a danger to public health.
The premises in Roscommon were the Mother India restaurant on The Square, the kitchen of The Central Bar on Market Square and Roscommon Golf Club Restaurant.
Four prohibition orders were also served in April, including three on Iskon Ireland -- which was trading as Govindas on Dublin's Aungier Street, Merrion Row and Middle Abbey Street -- and the Real Brasil grocery, Unit 2, Castle Street, Roscommon.
The FSAI found activities in the establishments -- either the handling, processing, disposal, manufacturing, storage, distribution or selling of food -- was likely to involve a serious risk to public health.
Professor Alan Reilly, FSAI chief executive, said it was disappointing to have a rise in the number of prohibition orders handed out.
"We would stress to food businesses the importance of maintaining the highest standards of food safety hygiene practices at all times," he said.
"We would also encourage food businesses to visit our website, as it is a comprehensive source of information on every aspect of food safety, food hygiene management, food safety training and food legislation."
The FSAI added that in April successful prosecutions were carried out by the Health Service Executive West Region on Harveys Point Hotel, Lough Eske, Donegal; Monsoon Valley restaurant, Unit 5, Building 2, Retail Park, Bundoran, Donegal; and The Oven Door, The Diamond, Donegal Town, Donegal.
"There is no excuse for food businesses to be unaware of their legal responsibilities to protect consumer health in relation to food safety," added Prof Reilly.