The most common reasons people get a cold are from viruses, including the common cold.
But there are other reasons, too.
Here are 10 common colds and how to get them under control.
It’s just a cold.
Many people get sick because of allergies.
This one is common in Europe, where many people get allergenic reactions to the common allergen, which is often an animal.
A study published in the journal Infectious Diseases in 2018 found that about one-fifth of adults in Europe have at least one allergic reaction to some sort of animal.
And that number rose to one-third in North America and the Caribbean.
But the study didn’t look at specific allergens, like cowpox, to see if allergies are common in people who don’t have allergies.
The results were a bit less surprising: In Europe, one-quarter of the adults with allergic reactions reported they got a cold from a cow.
And about half of those people had a cold during the previous week.
A second study found that the number of people with allergic reaction during the preceding week was twice as high in people with a cold as it was in people without a cold, according to the Centers for Disease Control and Prevention.
It has a lot of germs.
Most people get some of their health problems from a lot, including viruses.
There are about 2.8 billion viruses circulating in the world, according the World Health Organization.
So many viruses that they are often referred to as “swarms,” or “virus hordes.”
But that doesn’t necessarily mean that there’s lots of viruses in our homes, or even in our bodies.
The virus population is actually much smaller than most people think.
There’s only a few hundred million viruses in the human body, according.
And only a small fraction of them infect people.
But when we are exposed to them, they can lead to health problems, including viral infections.
It can make you sick.
The viruses that cause most illnesses in the body are usually harmless to us.
But some viruses are harmful, too, like the coronavirus and the herpes virus, which can cause herpes simplex.
And other viruses can cause more serious illnesses, including pneumonia, which affects the lungs and can cause a life-threatening pneumonia.
Some viruses also cause pneumonia, and other viruses are known to cause diarrhea and stomach ulcers.
It could be a sign of an infection.
A cold can also be a warning sign that something is wrong, even if you aren’t sick.
If you get a fever, a cough or a runny nose, then you’re more likely to get a viral infection.
That’s because viruses are very active when they’re circulating.
But it’s also possible that you might have an infection that’s not contagious, like a sore throat.
It depends on how well you have your immune system working, how old you are, how well your body is recovering from surgery or a surgery-related illness, and how often you get viral infections, according a study published last year in the British Medical Journal.
It means you may need to get checked out.
If your cold is severe enough to cause a hospital stay, it may also mean you may be infected with a virus, such as the common flu.
So if you are sick enough to need a hospital visit, you may want to get tested, according this CDC guideline.
You should also make sure you are getting all the right medicines for your condition.
If the symptoms are getting worse, you could have a respiratory infection.
And even if the cold is mild, you can have a fever and runny noses.
A third way to get sick with a common cold is to get infected with something called anaerobic bacteria.
A common cold often causes sneezing, coughing and a runty nose, and can also cause diarrhea, according as the CDC.
The more common bacteria that can cause pneumonia are Helicobacter pylori and Pseudomonas aeruginosa.
You might need to go to a doctor.
You can get a bacterial infection called a pneumonitis, which involves breathing in airborne bacteria, and you can get pneumonia, both from breathing in viruses and from other common cold-related illnesses, according according to Mayo Clinic.
You also can get some other diseases from getting pneumonia.
It is common to get pneumonia in the elderly, according it’s a common cause of death in the U.S. for the elderly.
And people older than 65 years old may also get pneumonia if they have a lung infection.
It makes you more likely for an infection to spread.
You don’t need to worry about getting an infection from getting colds.
If there is no sign of infection, it’s common for people with more severe or chronic infections to get more severe ones.
For example, a common infection can lead someone to develop pneumonia, but if the person also has a