More than 50 new cases of salmonella have been identified in the last week amid three major outbreaks linked to imported eggs, health officials have said.The UK Health Security Agency (UKHSA) has today confirmed a total of 528 cases – a jump from 474 last Thursday.Some 305 infections have been recorded in the current outbreak, up from 259 this time last week, and one person has died.Another death has been recorded in a cluster with 41 cases, while the remaining 182 infections have been linked to a third spread.Investigations are ongoing but health chiefs believe imported eggs are the likely culprit. British cases so far have been linked to eating out at 'small cafes, restaurants and takeaway businesses,' the UKHSA said.And as public health officials rush to identify the source, cases have also been reported in Austria, Belgium, Denmark, France, Germany and the Netherlands. More than 50 cases of salmonella have been identified in the last week amid three major outbreaks linked to imported eggs, health officials have saidWhile the UKHSA has identified a 'link to imported eggs', Dutch health officials have investigated chicken products as a possible source of infection. Food safety chiefs are urging Britons to avoid 'raw or lightly cooked egg' products such as mousses, mayonnaise or hollandaise sauce.Vulnerable groups – including over-65s, pregnant women and under-fives – are also advised to avoid runny eggs when eating out.Officials say there is no evidence that eggs produced in the UK pose any threat.Salmonella is typically caught by eating contaminated food such as poultry, meat, eggs, raw fruit and vegetables and unpasteurised dairy products. Symptoms include stomach cramps and diarrhoea, and it can lead to severe dehydration, blood poisoning, organ failure and even death. Those most at risk of fatal complications include infants, pregnant women, the elderly and those with weakened immune systems.More than a third of patients in the three outbreaks have required hospital treatment. Most cases have been recorded in recent weeks and months, but the samples date back as far as August last year. The North East of England and London are the worst-affected areas, while the South West has the lowest infection rate.