No, diesel engines don't have ignition coil as they work on compression ignition and not on spark ignition as in diesel engines. Glow plugs used in diesel are like small electric heaters which use the mechanism of heating due to resistance during electrification.
Clarithromycin is another antibiotic treatment for walking pneumonia. It is more powerful than even erythromycin as it is also used to help treat HIV/AIDS patients. It works by interfering with the protein synthesis of bacteria, which prevents them from growing further. It is given in the form of tablets or a gel.
There is a certain level of immunity that occurs after someone has a case of walking pneumonia. It isn't permanent, though, and it's unclear how long it lasts. So you could at some point develop walking pneumonia again. When it does recur, it may be milder.