From Wikipedia, the free encyclopedia. Prostaglandin D2 (or PGD2) is a prostaglandin that binds to the receptor PTGDR (DP 1), as well as CRTH2 (DP 2). It is a major prostaglandin produced by mast cells â recruits Th2 cells, eosinophils, and basophils.In mammalian organs, large amounts of PGD 2 are found only in the brain and in mast cells. It is critical to development of allergic diseases such as asthma.t is a major prostaglandin produced by mast cells â recruits Th2 cells, eosinophils, and basophils. In mammalian organs, large amounts of PGD 2 are found only in the brain and in mast cells.
Viral and bacterial conjunctivitis. Viral conjunctivitis and bacterial conjunctivitis may affect one or both eyes. Viral conjunctivitis usually produces a watery discharge. Bacterial conjunctivitis often produces a thicker, yellow-green discharge.Both types can be associated with colds or symptoms of a respiratory infection, such as a sore throat.Both viral and bacterial types are very contagious. They are spread through direct or indirect contact with the eye secretions of someone who's infected.acterial conjunctivitis often produces a thicker, yellow-green discharge. Both types can be associated with colds or symptoms of a respiratory infection, such as a sore throat. Both viral and bacterial types are very contagious.
Bacterial conjunctivitis can usually be diagnosed by a doctor, nurse, or other healthcare provider from symptoms and patient history. For example, if conjunctivitis occurs at the same time as an ear infection and if discharge from the eye is thick rather than watery, the cause may be a bacterium.epending on the cause of viral conjunctivitis, some patients may have additional symptoms or conditions, such as the following: 1  Common cold, flu, or other respiratory infection â conjunctivitis often occurs with respiratory infections; sometimes the lymph node near the front of the ear is enlarged and painful.