Accessing invasion-competent Plasmodium vivax merozoites reveals antibody-dependent NK cell activation.

A new platform enables high-yield isolation of invasion-competent P. vivax merozoites, revealing that antibody-opsonized merozoites activate human NK cells.

• Why it matters: Understanding P. vivax merozoite biology and immune recognition is limited by the difficulty of obtaining viable, invasion-competent merozoites, hindering malaria research and vaccine development.
• What they did: The authors developed a synchronized, high-yield isolation method using reversible egress inhibition and mechanical release, achieving over 75% recovery of structurally intact merozoites from ex vivo cultures.
• The result: This platform demonstrates that antibody-coated P. vivax merozoites can activate human natural killer cells, suggesting a functional role for antibody-dependent immune responses in malaria.