Which leukocyte is primarily involved in fighting viral infections?

T lymphocytes, also known as T cells, play a crucial role in the immune response against viral infections. When a virus infects a cell, it often displays viral proteins on its surface. T cells are specifically designed to recognize these altered proteins. There are several subtypes of T cells, but cytotoxic T cells (CD8+ T cells) are particularly effective in identifying and killing infected cells. They directly bind to these infected cells and induce apoptosis, effectively eliminating the source of the viral replication.

In addition to cytotoxic T cells, helper T cells (CD4+ T cells) assist in orchestrating the immune response by releasing cytokines that enhance the activity of other immune cells, including B cells and macrophages. This collaboration is essential for a robust immune response against viruses.

In contrast, neutrophils are primarily involved in combating bacterial infections rather than viral ones, while B lymphocytes are mainly responsible for producing antibodies, which play a significant role in responding to extracellular pathogens. Basophils are linked to allergic responses and parasitic infections, not specifically to viral defense. Thus, T lymphocytes are the key players in fighting viral infections.