Parasites evade host defenses by which of the following means?

Parasites evade host defenses by which of the following means?

• A. Sequestering Themselves Within Host Cells
• B. All of the Above
• C. Production of Antigens Similar to Host Antigens
• D. Changing Surface Antigens

Answer: (B)

Parasites use multiple tactics to slip past the host’s defenses, often working in concert to stay one step ahead of immune responses. Sequestering themselves within host cells or hiding in tissues helps them avoid circulating antibodies and splenic clearance. When a parasite is inside a cell, antibodies have a harder time reaching it, and the infected cell can shield the parasite from immune attack. Some parasites also attach to capillary walls or reside in privileged sites, further reducing immune visibility. Molecular mimicry is another strategy: by displaying host-like antigens or coating themselves with host proteins, parasites can masquerade as “self” and dampen immune recognition, making it harder for the immune system to label them as foreign. Antigenic variation is a dynamic defense where the parasite continually switches the proteins displayed on its surface. Antibodies generated against earlier variants no longer recognize the new ones, allowing the parasite to persist or reinfect despite an existing immune response. Because parasites employ all of these approaches, the option that includes “all of the above” is the best answer.

Parasites use multiple tactics to slip past the host’s defenses, often working in concert to stay one step ahead of immune responses.

Sequestering themselves within host cells or hiding in tissues helps them avoid circulating antibodies and splenic clearance. When a parasite is inside a cell, antibodies have a harder time reaching it, and the infected cell can shield the parasite from immune attack. Some parasites also attach to capillary walls or reside in privileged sites, further reducing immune visibility.

Molecular mimicry is another strategy: by displaying host-like antigens or coating themselves with host proteins, parasites can masquerade as “self” and dampen immune recognition, making it harder for the immune system to label them as foreign.

Antigenic variation is a dynamic defense where the parasite continually switches the proteins displayed on its surface. Antibodies generated against earlier variants no longer recognize the new ones, allowing the parasite to persist or reinfect despite an existing immune response.

Because parasites employ all of these approaches, the option that includes “all of the above” is the best answer.