Amalia likely got the flu, a communicable disease causing a cough and runny nose, by touching the doorknob in a classroom. Here's why:
1. The flu is a contagious respiratory illness spread through droplets when an infected person talks, coughs, or sneezes. These droplets can land on surfaces like doorknobs, where the virus can survive for a certain period.
2. When a healthy person touches a contaminated surface like a doorknob and then touches their face (like their mouth, nose, or eyes), they can introduce the virus into their body, leading to infection.
3. While factors like lack of exercise and poor diet can weaken the immune system, making a person more susceptible to infections, in this case, the most direct route for Amalia to contract the flu seems to be through touching a contaminated surface in a shared space like a classroom.
4. Inheriting the flu from parents is not a common way to contract the virus, as the flu is typically transmitted through direct contact with respiratory droplets or contaminated surfaces.
Therefore, based on the information provided, the most likely scenario is that Amalia got the flu by touching the doorknob in a classroom where the virus was present.
