Abstract
It has been shown that influenza is influenced by increasing bacteria in the oral cavity. Oral infectious diseases and poor oral hygiene are risk factor for aspiration of oral microorganisms to enter the lower respiratory tract and thus cause respiratory infectious disease. Recent clinical studies revealed that co-infection of SARS-CoV-2 with oral bacteria aggravated pneumonia by interacting with immune responses. Oral health by dentistry and oral care is significantly effective to reduce risk of respiratory virus infections.
https://ror.org/0220f5b41 
