The recent an flu outbreak is caused by which of the following strain

H5 N1 is the most common an flu strain that has been endemic in the world for the past 15 years origin It was first repoed from hong kong in 1997 and has spread to various countries including India Transmission Transmission to man occurs only from birds , and requires close respiratory contact clinical feature H5N1 an flu strains are associated with higher rates of pneumonia and extra pulmonary manifestations such as diarrhoea and CNS involvement Ref: Essentials of Medical microbiology apurba sastry 1st edition page 462