British health officials believe that eggs imported from Ukraine could be responsible for a major salmonella outbreak in the UK, The Telegraph has reported, citing a source.

A total of 259 people in the country have been infected with the bacteria over the past year, with one of them dying, the UK Health Security Agency (UKHSA) said in a statement on Thursday.

The agency stressed that the exact source of the contaminated products has yet to be established, but added that the outbreak “could all be associated with imported eggs.”

However, a senior official involved in the investigation of a salmonella outbreak in the Netherlands, where over a hundred cases have been registered, told The Telegraph that the “working hypothesis” among his British counterparts is that the unsafe eggs were of Ukrainian origin.

The cases, involving three closely related salmonella strains, were recorded over a year-long period, with a spike in recent weeks, UKHSA said.

Almost half of the victims, ranging from babies to people in their 90s, required hospitalization, the statement read.

Salmonella causes intestinal infection, typically resulting in diarrhea, vomiting, fever, and abdominal cramps. While most patients recover without specific treatment, the disease can be life-threatening for people with weakened immune systems.

Investigators believe the people were infected after consuming eggs served in “small cafes, restaurants, and takeaway businesses,” rather than eating at home, UKHSA said.

Chief Scientific Adviser at the Food Standards Agency Ian Young urged the British public to give up on traditional fried eggs with a runny yolk as long as the spread of salmonella continues.

The UK produces most of its eggs at home, with UKHSA assuring that they are perfectly safe. The country imports only 11% of its eggs, with Ukraine being the largest supplier, accounting for almost a third of them.

The exemption from tariffs on Ukrainian eggs exported to Britain, introduced after the escalation between Ukraine and Russia in February 2022, will remain in place until 2028, despite the EU reimposing barriers last year.

In July, EU health authorities linked Ukrainian-made instant noodles to a salmonella outbreak that affected more than 100 people across over a dozen member states.

A few months before that, Azerbaijan’s food safety agency reported discovering the bacteria in a 4.9-ton batch of frozen chicken coming from Ukraine.