COVID-19 is a respiratory illness that affects the respiratory tract. It can cause mild to critical breathing problems. Some people with other health conditions may also experience serious symptoms.
SARS-CoV-2 is a family of coronaviruses that infects the respiratory tract. When it gets in, it comes into contact with the membranes that line your mouth and nose.
The trunk is the part of your respiratory tract that's divided into smaller and bigger branches. These branches are known as alveoli, which are tiny air sacs.
COVID-19 is a new coronavirus that can affect your body's defenses. It can cause severe illness if it gets into your lungs.