Read the passage and answer the Colds and flu are viral infections of the upper respiratory tract. They are extremely contagious. They are spread by airborne droplets of mucus. The virus can also be passed on by physical contact if the recipients pick up the virus on their hand and rub their eyes or nose. This passage primarily focused on
The passage discusses how colds and flu spread, highlighting airborne droplets and physical contact. - The main focus of the passage is on the spread of colds and flu infections. When reading passages about diseases, focus on keywords related to transmission and symptoms to identify the central theme.