What kind of infection is possible with a high white blood count?

A high white blood cell (WBC) count, also known as leukocytosis, can indicate the presence of an infection in the body. When the body detects an infection, it produces and releases WBCs to combat the invading pathogens. Different types of WBCs, such as neutrophils, lymphocytes, eosinophils, basophils, and monocytes, have specific roles in identifying and eliminating these pathogens.

A high WBC count can be associated with various types of infections, including:

Bacterial infections: Common bacterial infections that may cause an elevated WBC count include pneumonia, urinary tract infections (UTIs), sepsis, skin infections (cellulitis), and meningitis.

Viral infections: Some viral infections can also lead to a high WBC count, such as influenza (flu), viral hepatitis, infectious mononucleosis ("mono"), and viral meningitis.

Parasitic infections: Certain parasitic infections, like malaria, can cause an increase in WBC count as the body responds to the invading parasites.

Fungal infections: Severe fungal infections, such as invasive candidiasis, can also result in elevated WBC levels.

In addition to infections, other conditions and factors can also cause a high WBC count, including autoimmune disorders, leukemia, certain medications, inflammation, severe stress, strenuous exercise, smoking, and pregnancy.

Therefore, the specific type of infection associated with a high WBC count needs to be determined based on the patient's symptoms, medical history, laboratory findings, and physical examination by a healthcare professional.