Which of the following conditions can lead to leukocytosis?

Leukocytosis refers to an increase in the number of white blood cells (WBCs) in the bloodstream, a response typically associated with the body's immune reaction to various stimuli, including infections and inflammation. Local infections can significantly stimulate the production of white blood cells as the body works to combat pathogens.

When a localized infection occurs, such as an abscess or cellulitis, the body responds by mobilizing WBCs to the affected area. This response may lead to an increase in the overall count of leukocytes in the blood, as the bone marrow ramps up the production of these cells to aid in fighting the infection. Additionally, the type of leukocytes that increase can vary, depending on the nature of the infection (e.g., bacterial, viral, etc.), further highlighting the body's adaptive immune response to specific threats.

In contrast, while conditions like advanced typhoid, malaria, and radiation exposure may influence white blood cell counts under certain circumstances, they do not universally lead to leukocytosis in the same direct and consistent way that local infections do. For instance, advanced typhoid can sometimes lead to leukopenia rather than leukocytosis, while malaria typically presents with complex immune responses that may not always increase overall WBC