Which infection invades and replicates in T4 lymphocyte cells, leaving the body open to opportunistic infections?

Sepsis is not an infection itself but a severe response to an infection that can result from various pathogens, including bacteria, viruses, and fungi. It does not specifically target T4 lymphocyte cells; rather, it is a systemic condition that can occur as a complication of any serious infection.

Methicillin-resistant Staphylococcus aureus (MRSA) is a type of bacteria resistant to many antibiotics. While it can cause severe infections, it does not specifically invade T4 lymphocytes; instead, it affects various tissues and can lead to localized or systemic infections, particularly in immunocompromised individuals.

Influenza is a viral infection that primarily targets the respiratory tract. Although it can have severe implications, especially in vulnerable populations, it does not specifically infect T4 lymphocyte cells. The immune response to influenza involves various immune cells but does not directly compromise T4 cell populations.