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    "story_id": "mp-2026-08-04-012",
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    "headline": "WhatsApp Made the Tank Visit Stick",
    "slug": "whatsapp-made-the-tank-visit-stick",
    "dek": "Community visits plus messaging improved household prevention practices and reduced mosquito-vector measures more than visits alone.",
    "summary": "Community visits plus messaging improved household prevention practices and reduced mosquito-vector measures more than visits alone.",
    "body_text": "A three-group implementation study in two Colombian municipalities compared usual control, community visits, and visits plus WhatsApp support. Among 874 households, the combined group improved management of small breeding sites by 15.9 percentage points and showed broader gains in preventive practice and entomological indices than visits alone; participants also rated the messaging acceptable. The quasi-experimental design supports WhatsApp as a practical engagement layer in this setting, but it does not establish universal effectiveness and the trial was registered retrospectively.",
    "why_it_matters": "Community visits plus messaging improved household prevention practices and reduced mosquito-vector measures more than visits alone.",
    "limitations": [
      "The quasi-experimental design supports WhatsApp as a practical engagement layer in this setting, but it does not establish universal effectiveness and the trial was registered retrospectively."
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        "qualification": "The quasi-experimental design supports WhatsApp as a practical engagement layer in this setting, but it does not establish universal effectiveness and the trial was registered retrospectively."
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    "tags": [
      "public health",
      "mosquito control",
      "community engagement"
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    {
      "source_id": "source-2026-08-04-012",
      "title": "BMC Public Health: WhatsApp-supported arbovirus prevention in Colombia",
      "publisher": "BMC",
      "url": "https://doi.org/10.1186/s12889-026-28576-7",
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    "title": "WhatsApp Made the Tank Visit Stick",
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