Homedisease and immunity Modes of transmission of infectious diseases.. Air, water and food, blood and animal vectors insects and mosquitoes, birds and pets Direct ways: Direct contact with the patient or the use of tools. Indirect ways: Such as air, water, food, blood and animal vectors insects and mosquitoes, birds and pets. Facebook Twitter Share:Modes of transmission of infectious diseases.. Air, water and food, blood and animal vectors insects and mosquitoes, birds and pets Facebook Twitter WhatsApp Pinterest LinkedIn Reddit Tumblr Telegram Email