You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is At present following types of influenza viruses are circulating in the world, except - and explain in detail?
INFLUENZA Causative agent : Ohomyxovirus, 3 types: A, B, C Type A: MC cause of outbreaks/epidemics; Only cause of pandemics Type B Type C: Not circulating currently Currently circulating influenza viruses in world H1NI (Type A) - Cause of Swine Flu H2N2(Tpye A) H5N1(Type A) - Cause of An influenza (Bird flu) H3N2 H7N9 H5N6 Type B Ref: Park 25th edition Pgno : 169-171