According to the article linked in the related links section below:
A cold is contagious for at least a day before you come down with the symptoms. During that time you may be transmitting the cold virus to all of your buddies and co-workers even when you're feeling fine. Once you come down with the symptoms, a cold is contagious until the last of your symptoms go away.
However, the author points out that the virus is most contagious when viral levels in your body are highest, so it is highly contagious before symptoms appear or when they first start appearing, but much less contagious 3-4 days after the first appearance of symptoms, as your immune system will have killed off most of the virus by then. The author recommends,
If you're considering calling in to work, it's a good idea for at least the first three to four days when a cold is most contagious. If you're still sniffling and coughing at the end of that time period, you'll likely still be somewhat contagious, but less so. If you go to work, it's important to use a tissue to cover your mouth when you cough or sneeze and avoid contact with others as much as possible. Your employees will thank you for your kind consideration.
No, all cold viruses are contagious.
Sore throat caused by environmental conditions is not contagious.
Usually, yes. The most common causes are respiratory synsythial virus (RSV), parainfluenza viruses, influenza viruses. Metapneumovirus, human bocavirus, and a number of other recently discovered viruses are implicated as well.
Chickenpox is no longer contagious after the bumps are scabbed over and dry.
Bronchopneumonia itself is not contagious, as it is an infection of the lungs commonly caused by bacteria or viruses. However, the bacteria or viruses that cause bronchopneumonia can be contagious from person to person through respiratory droplets. It is important to practice good hygiene measures to prevent the spread of these infectious agents.
It depends, if they are treated they are no longer contagious. If they are infected or not treated they can be spread to other humans.
Chickenpox is no longer contagious once the lesions are scabbed over. So it is possible for spots to be visible, but to no longer be contagious.A chickenpox rash is contagious until all lesions are scabbed over. A person may no longer be contagious even if the spots are still visible.
yes colds and flu viruses are fast contagious
That is true. Bacteria respond to medications (antibiotics) and viruses do not.
stay away from other people with contagious diseaseswash your handsget vaccinated of course!
Yes, viral infections are contagious, meaning they can spread from person to person through direct or indirect contact with respiratory droplets, bodily fluids, or contaminated surfaces. It is important to practice good hygiene, such as washing hands frequently and avoiding close contact with infected individuals, to reduce the risk of spreading the infection.
Yes it is contagious. It is contagious because it is caused by viruses such as HIV/AIDS. It does not go away on it's own so you need some sort of treatment for it. Here is a pdf file explaining all of it. http://www.cehjournal.org/download/ceh_18_53_073.pdf