LONDON (Reuters) -The number of diphtheria cases in England has risen this year, health officials said on Monday, citing dozens of cases found among asylum seekers arriving into the country, but adding that the risk of infection to the wider public remained very low. Data released by the Health Security Agency (UKHSA) said there were around 50 cases among asylum seekers who arrived in England between Jan. 1 and Nov. 25, compared with an average of 2 to 11 cases in the country per year over the last decade. Diphtheria is an infectious disease that primarily affects the upper respiratory tract. …