A mixture: 1  can be separated into 2 or more substances by physical or mechanical means. 2  displays the properties of the pure substances making it up. 3  its composition can be varied by changing the proportion of pure substances making it up.  heterogeneous substances, ones with non-uniform composition throughout the sample, are always mixtures.
Injection Site Symptoms. At least half of all people who receive pneumonia shots will experience mild side effects in the area of injection, such as pain or redness. Less commonly, swelling or hardness may also occur in the area. These symptoms can limit movement of the arm or leg where the shot was given.
But pneumonia can be a serious problem for people at high risk for the disease, including senior citizens, very young children, and those with a chronic lung condition. A pneumonia vaccine is available to protect against certain types of this potentially deadly illness.Pneumonia symptoms often include: 1  Coughing up mucous or even blood. 2  Extreme fatigue. 3  Trouble breathing. 4  Chest pain that gets worse when you breathe deeply or cough. 5  High fever with chills. 6  Headaches.hile the flu is also caused by a virus, it's a whole different kind of illness. Cold symptoms are relatively mild, whereas the flu causes much more severe symptoms. Influenza can really wipe out even a healthy person, says Milstone. There is a vaccine to prevent, and medication to treat, certain strains of the flu.