<s>[INST]  How serious is pneumonia? [/INST] The severity of pneumonia depends on a person’s general health, age and how strong is their immune system. It is also less serious when it is caused by a virus.Pneumonia can be deadly in infants less than 2 years and elders more than 65 years. It can also be fatal in persons with weakened immune systems. Source: MedIndia. Link: https://www.medindia.net/patients/patientinfo/pneumonia-faq.htm. Field: Lung Disease. Disease: Pneumonia </s>