My internist reminded that I hadn't had a pneumonia vaccination since 2004 and I am about 69 years old and at risk due to PD, the aspiration issue. I got the damn vaccination and then 2 days later I had a hot swollen red area on my arm below the IM injecton site that the doctor diagnosed cellulitis a dangerous bacterial infection. By the 7th day of a 10 prescription for Keflex I noticed that I was having a hell of a time managing my PD symptoms using my routine MP and some helpful supplements. I attributed the trouble to the Keflex causing probable destruction of the normal gut flora that is necessary to digest my MP so I revert (once again) to taking out my old supply of Sinemet. Voila! Symptoms back under control; plus, I am reminded of why I dislike taking Sinemet (dizziness, bladder control issues, short half life, memory issues get worse...etc.) Am taking extra b vitamins now and hope to restore the gut flora rapidly. Two more days of Keflex to go.