Bacterial infection (sepsis)
Streptococcus pneumonia
Haemophilus influenzae type B
Neisseria meningitidis
Capnocytophaga canimorsus
Bordetella holmesii
Viral illness
Streptococcus pneumonia
Haemophilus influenzae type B
Neisseria meningitidis
Capnocytophaga canimorsus
Bordetella holmesii
Asplenic patient
Bacterial infection 
Combative patient
Streptococcus pneumonia
The obese patient
Haemophilus influenzae type B
Severe anemia in Jehovah's Witness patients
Neisseria meningitidis