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.
Some cases of walking pneumonia are never diagnosed because people don't seek medical help. If you do go to the doctor, the diagnosis will depend on your medical history and the results of a physical exam. The doctor will start by asking you about your symptoms and how long you have had them.