chemical formula a combination of symbols used to express the chemical components of a substance. empirical formula a chemical formula that expresses the proportions of the elements present in a substance.
The bacteria streptococcus pneumoniae is the most common cause of acute bacterial sinusitis. This type of bacteria can be resistant to the most common types of antibiotics at standard dosages, although there are other antibiotics that can be used to treat the condition.
Sinusitis is caused by an inflammation of your sinus cavities that causes redness, swelling, mucus, and pain. There are two types of sinusitis: Acute sinusitis - an infection that is often triggered by the flu or cold. The flu or cold virus attacks your sinuses causing them to swell and become narrow.