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.
Every vaccine comes with a chance of side effects, and the Tdap vaccine is no exception. Fortunately, reported side effects with Tdap are generally mild and go away on their own. Mild to moderate side effects may include: mild pain, redness, or swelling at the shot site; tiredness ; body aches ; headache ; nausea, vomiting, or diarrhea ; fever ; swelling of the entire arm in which the vaccine was given ; Severe problems after the Tdap vaccine are rarely reported, but may include: