Final answer:
Without specific information about Mrs. Yarborough's condition and treatment response, it is not possible to determine whether she has bacterial or viral pneumonia. Antibiotics are effective against bacterial pneumonia but not against viral pneumonia, which could also be indicated by an ineffective antibiotic treatment unless it is resistant bacteria.
Step-by-step explanation:
To determine whether Mrs. Yarborough has bacterial or viral pneumonia, it's important to consider the effectiveness of antibiotic treatment. If Mrs. Yarborough's condition did not improve with antibiotics, as with the case of John, a viral pneumonia is possible since antibiotics do not treat viral infections. Alternatively, it could be an antibiotic-resistant bacterial infection. However, given the lack of specific information about Mrs. Yarborough's response to antibiotics, one cannot definitively conclude the type of pneumonia.
Meanwhile, bacterial pneumonia is characterized by symptoms such as fever, cough, and respiratory distress, and common pathogens include Streptococcus pneumoniae, Haemophilus influenzae, and Mycoplasma pneumoniae. Viral pneumonia often involves pathogens like influenza viruses, adenoviruses, and respiratory syncytial viruses. In contrast, Tracy's bacterial pneumonia, caused by H. influenzae, was confirmed by tests and successfully treated with antibiotics. This suggests that bacterial pneumonia can be confirmed through laboratory tests and responds well to appropriate antibiotic therapy.