New Zealand Food Safety have stopped a third North Island egg producer from selling eggs after tests found a strain of the potentially dangerous bacteria salmonella, RNZ reports. Salmonella can cause diarrhoea, vomiting and fever, and can be particularly serious for the elderly, frail, and pregnant women. Eggs that could be of concern are currently marketed under multiple brand names, and the ban on affected brands will stay in place until officials are sure the eggs are safe.