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.
Pneumonia Vaccine Side Effects. When it comes to pneumonia vaccine side effects, there is a debate whether this vaccine can cause serious side effects or not. Companies that are producing the vaccine claim that its negative side effects are within the tolerable limits and cannot cause any serious problems. Pneumonia Vaccine and side effects.