<h1>Public Health and Disease Control</h1> <p>Singapore's public health system covers population-level prevention, surveillance, and control of infectious and environmental health threats — work that sits alongside, but is distinct from, the hospital-centric clinical system described in <a href="/en/knowledge/article/sgkb.healthcare.healthcare-system-overview">healthcare system overview</a>. Where <a href="/en/knowledge/article/sgkb.healthcare.hospitals">hospitals</a> and <a href="/en/knowledge/article/sgkb.healthcare.polyclinics-and-primary-care">polyclinics and primary care</a> treat individual patients, public health agencies watch whole populations: mandating disease notification, running national vaccination schedules, inspecting food premises, suppressing mosquito vectors, and coordinating outbreak response. Since <strong>April 2025</strong>, the <strong>Communicable Diseases Agency (CDA)</strong> is the dedicated public health authority for communicable diseases under the Ministry of Health (MOH), consolidating infectious-disease functions previously spread across MOH headquarters, the <strong>Health Promotion Board (HPB)</strong>, and the National Centre for Infectious Diseases (NCID) (<a href="https://www.moh.gov.sg/newsroom/formation-of-communicable-diseases-agency-and-appointment-of-professor-vernon-lee-as-ceo/">MOH, Feb 2025</a>; <a href="https://www.cda.gov.sg/about-cda/who-we-are/">CDA, accessed Aug 2026</a>). HPB remains MOH’s statutory board for health promotion and chronic-disease prevention, while the National Environment Agency (NEA) continues as the national authority on environmental public health (<a href="https://www.hpb.gov.sg/about/about-us/">HPB, accessed Aug 2026</a>; <a href="https://www.nea.gov.sg/corporate-functions/who-we-are/groups-and-divisions/public-health-groups-and-divisions">NEA, accessed Aug 2026</a>). Agency-role anchors without invented outbreak tallies are in <a href="/en/knowledge/dataset/sgkb.data.public-health-agency-anchors">public health agency anchors</a>.</p> <h2>The Communicable Diseases Agency</h2> <p>The Communicable Diseases Agency, established in April 2025 as a statutory board under MOH, is Singapore's dedicated public health authority for communicable diseases (<a href="https://www.cda.gov.sg/about-cda/who-we-are/">CDA, accessed Aug 2026</a>). CDA consolidates detection, prevention, and control functions previously distributed across MOH headquarters, HPB, and NCID — a reorganisation announced during the 2023 parliamentary debate on Singapore's COVID-19 response and formally launched by the Prime Minister on 12 November 2025 (<a href="https://www.cda.gov.sg/news-and-events/official-launch-of-communicable-diseases-agency/">CDA launch, Nov 2025</a>). NCID continues as a clinical centre within the CDA structure, with its executive director reporting through the agency (<a href="https://www.cda.gov.sg/about-cda/who-we-are/">CDA, accessed Aug 2026</a>).</p> <p>CDA's mandate spans five operational areas: <strong>prevent</strong> disease spread through vaccination policy, public education, and infection prevention; <strong>prepare</strong> sectoral readiness and access to vaccines and therapeutics; <strong>detect</strong> through strengthened surveillance including new modalities and data analytics; <strong>respond</strong> to cases and outbreaks with investigation, contact tracing, and public health measures; and <strong>enable</strong> these functions through research and international cooperation (<a href="https://www.moh.gov.sg/newsroom/formation-of-communicable-diseases-agency-and-appointment-of-professor-vernon-lee-as-ceo/">MOH, Feb 2025</a>). Early initiatives after becoming operational include the Singapore Pandemic Preparedness and Response Framework in July 2025 and a September 2025 update to the National Adult Immunisation Schedule adding Shingrix and PCV20 (<a href="https://www.cda.gov.sg/news-and-events/official-launch-of-communicable-diseases-agency/">CDA launch, Nov 2025</a>).</p> <p>The split from HPB is structurally important for retrieval. HPB, established in 2001, remains MOH's agency for health promotion and disease prevention — nutrition, physical activity, mental well-being, health screening, tobacco control, and lifestyle programmes that support Healthier SG — but is <strong>not</strong> the lead infectious-disease surveillance and outbreak-control authority after CDA’s formation (<a href="https://www.hpb.gov.sg/about/about-us/">HPB, accessed Aug 2026</a>; <a href="/en/knowledge/dataset/sgkb.data.public-health-agency-anchors">public health agency anchors</a>). CDA owns communicable-disease epidemiology, the national immunisation policy schedules, outbreak investigation, and the National Public Health Laboratory. Clinical treatment of infected patients still flows through hospitals and primary care; CDA sets the population-level rules and coordinates the response around them. This article does not invent current outbreak case counts; for incidence, use the dated CDA surveillance release that matches the question’s period.</p> <h2>Disease surveillance and outbreak response</h2> <p>Singapore's principal legislation for infectious disease control is the <strong>Infectious Diseases Act (IDA)</strong>, jointly administered by MOH, the Singapore Food Agency (SFA), and NEA (<a href="https://www.cda.gov.sg/public/infectious-diseases-act/">CDA, accessed Aug 2026</a>). The IDA empowers the Director-General of Health to require notification of listed infectious diseases, isolate and treat infected persons, conduct contact tracing and quarantine, and order disinfection of premises. It provides a tiered hierarchy of responses — including declaration of a Public Health Threat or Public Health Emergency by the Minister for Health — so outbreak management can scale with severity. Port-of-entry measures to prevent disease importation are also stipulated under the Act.</p> <p><strong>Notifiable disease surveillance</strong> is the backbone of detection. Licensed doctors and laboratories must report specified infectious diseases to the authorities; CDA publishes annual surveillance reports covering air/droplet-borne, vector-borne, food-borne, blood-borne, and sexually transmitted diseases, alongside programme coverage data (<a href="https://www.cda.gov.sg/resources/communicable-diseases-surveillance-singapore-2023-2024/">CDA surveillance report 2023–2024, Dec 2025</a>). Clinical case reporting is supplemented by environmental and laboratory modalities. NEA's Environmental Health Institute (EHI) runs arbovirus diagnostics, genomic surveillance of dengue virus serotypes, and a wastewater surveillance network covering more than 500 sampling sites — initiated in February 2020 for SARS-CoV-2 and expanded from mid-2023 to include Zika virus, in partnership with CDA and PUB (<a href="https://www.nea.gov.sg/corporate-functions/resources/research/environmental_health_institute/wastewater-surveillance-programme/">NEA wastewater programme, accessed Aug 2026</a>). Wastewater sampling can capture community-level transmission including from mildly symptomatic or asymptomatic individuals who may not seek care, complementing clinical surveillance.</p> <p>When an outbreak is detected, CDA investigates cases, traces contacts, and recommends or implements control measures — the same operational chain exercised at scale during COVID-19 and in smaller episodes such as dengue clusters and food-borne incidents. NEA contributes vector-control operations and environmental disinfection during outbreaks; SFA handles food-safety enforcement where contaminated food is implicated. The IDA's tiered framework allows graduated measures — from targeted quarantine to economy-wide safe-management rules — without requiring ad hoc legislation for each crisis.</p> <h2>National immunisation programmes</h2> <p>Singapore maintains two nationally recommended vaccination schedules reviewed by MOH in consultation with the Expert Committee on Immunisation (ECI): the <strong>National Childhood Immunisation Schedule (NCIS)</strong> and the <strong>National Adult Immunisation Schedule (NAIS)</strong>, published by CDA (<a href="https://www.cda.gov.sg/public/vaccinations/">CDA vaccinations, May 2026</a>). The NCIS covers 14 vaccine-preventable diseases — tuberculosis, hepatitis B, diphtheria, tetanus, pertussis, poliovirus, Haemophilus influenzae type b, measles, mumps, rubella, varicella, pneumococcal disease, human papillomavirus, and influenza — with age-specific dosing from birth through adolescence. Vaccinations against <strong>measles and diphtheria are compulsory</strong> for children under the IDA (<a href="https://www.cda.gov.sg/public/vaccinations/">CDA vaccinations, May 2026</a>). The NAIS, established in November 2017, recommends vaccines for adults aged 18 and above against 12 diseases, with schedules tailored by age, occupation, medical conditions, and vaccination history (<a href="https://www.cda.gov.sg/public/vaccinations/">CDA vaccinations, May 2026</a>).</p> <p>Vaccines are delivered through multiple channels. Childhood doses are given at birth in hospitals, at <a href="/en/knowledge/article/sgkb.healthcare.polyclinics-and-primary-care">polyclinics</a> and private paediatric clinics, and through a <strong>school-based programme</strong> in which Tdap, IPV, HPV (for females), and MMR catch-up vaccines are provided at Primary 5, Secondary 1, and Secondary 2 (<a href="https://www.cda.gov.sg/public/vaccinations/">CDA vaccinations, May 2026</a>). Adult and senior vaccinations are available at participating CHAS clinics and public healthcare institutions; nationally recommended vaccines under the NAIS and NCIS receive subsidies at public healthcare settings, and Healthier SG enrollees can access fully subsidised NAIS vaccines at their enrolled clinic (<a href="https://www.cda.gov.sg/public/vaccinations/">CDA vaccinations, May 2026</a>; see <a href="/en/knowledge/article/sgkb.healthcare.healthcare-financing">healthcare financing</a> for the wider subsidy framework). The <strong>National Immunisation Registry</strong> records vaccination history, accessible to residents through an online portal and used to verify immunisation status for foreign-born children applying for long-term immigration passes (<a href="https://www.cda.gov.sg/public/vaccinations/">CDA vaccinations, May 2026</a>). HPB continues to run public-education campaigns promoting adult immunisation — for example urging seniors to take subsidised pneumococcal vaccines under Healthier SG — but policy and schedule ownership sit with CDA.</p> <h2>NEA and environmental public health</h2> <p>The National Environment Agency is Singapore's national authority on <strong>environmental public health</strong> — the non-clinical layer of public health that keeps the physical environment from becoming a disease vector or contamination source (<a href="https://www.nea.gov.sg/corporate-functions/who-we-are/groups-and-divisions/public-health-groups-and-divisions">NEA, accessed Aug 2026</a>). NEA's public health pillar spans vector control, sanitation, food-hygiene enforcement, public cleanliness, port health, and after-death services. This is distinct from MOH/CDA's clinical epidemiology mandate but tightly coupled to it: mosquito abundance drives dengue risk, and food-hygiene lapses drive food-borne outbreaks.</p> <p><strong>Food hygiene</strong> is a major NEA operational area. NEA licenses retail food establishments, inspects premises against the Code of Practice on Environmental Health (COPEH), and operates a Points Demerit System that can suspend licences after repeated lapses (<a href="https://www.nea.gov.sg/corporate-functions/who-we-are/groups-and-divisions/public-health-groups-and-divisions">NEA, accessed Aug 2026</a>). The <strong>Food Hygiene Recognition Scheme</strong> awards Bronze, Silver, or Gold decals to operators with consistent inspection track records of at least two, five, or ten years without major lapses — replacing the older annual A/B/C/D snapshot grading to reward sustained compliance (<a href="https://www.nea.gov.sg/media/readers-letters/index/new-grading-system-takes-into-account-the-track-record-of-eateries-from-every-hygiene-inspection">NEA, accessed Aug 2026</a>). Consumers can check suspension history and demerit points on NEA's Food Hygiene Information Portal. Food stall licences at hawker centres are issued by SFA, with NEA managing tenancy and environmental standards at NEA-managed <a href="/en/knowledge/article/sgkb.food-hawker-culture.hawker-centres">hawker centres</a> (<a href="https://www.nea.gov.sg/our-services/hawker-management/becoming-a-hawker">NEA hawker licensing, accessed Aug 2026</a>). SFA regulates food safety across the supply chain from import through manufacturing and distribution; NEA focuses on hygienic preparation and premises standards at the retail and food-service level.</p> <p><strong>Vector control</strong> is NEA's other high-profile public health function. The Environmental Public Health Operations Group deploys regional offices for ground operations — inspections, enforcement, and outbreak intervention — while the Environmental Health Institute researches vector biology, runs Project Wolbachia (mass release of Wolbachia-infected male <em>Aedes aegypti</em> mosquitoes to suppress wild populations and reduce dengue transmission), and integrates case, vector, virus, and ecological surveillance into outbreak forecasting (<a href="https://www.nea.gov.sg/corporate-functions/who-we-are/groups-and-divisions/public-health-groups-and-divisions">NEA EHI, accessed Aug 2026</a>). NEA also oversees public cleanliness, environmental sanitation during infectious-disease outbreaks, and the Haze Task Force that coordinates inter-agency air-quality responses during transboundary haze episodes (see <a href="/en/knowledge/article/sgkb.environment-sustainability.haze">haze</a>).</p> <h2>One Health coordination across agencies</h2> <p>Singapore adopted a <strong>One Health</strong> approach in 2012, recognising that human, animal, and environmental health are linked — zoonotic diseases, food safety, antimicrobial resistance, and vector ecology do not respect agency boundaries (<a href="https://www.cda.gov.sg/public/one-health/singapore-one-health-master-plan/">CDA One Health, Dec 2025</a>). The <strong>Singapore One Health Master Plan</strong>, published in December 2025, sets the national strategy across three pillars: engagements (communications, networking, leadership), sector development (partnerships and education), and insights (research, information sharing, and surveillance). CDA, NEA, NParks, PUB, and SFA collaborated on the plan through workshops in 2024 and 2025 (<a href="https://www.cda.gov.sg/public/one-health/singapore-one-health-master-plan/">CDA One Health, Dec 2025</a>).</p> <p>The framework's practical effects are everyday: integrated food safety from farm to hawker table; coordinated response when residents report sick wildlife; wastewater pathogen monitoring alongside clinical case counts; and joint rat-control enforcement with SFA at premises with poor refuse management (<a href="https://www.cda.gov.sg/public/one-health/singapore-one-health-master-plan/">CDA One Health, Dec 2025</a>; <a href="https://www.nea.gov.sg/corporate-functions/who-we-are/groups-and-divisions/public-health-groups-and-divisions">NEA, accessed Aug 2026</a>). ONEHealthSG branding unifies the inter-agency initiative. For residents, the distinction between agencies matters less than the outcome: clinical care when sick through <a href="/en/knowledge/article/sgkb.healthcare.polyclinics-and-primary-care">polyclinics and primary care</a> and <a href="/en/knowledge/article/sgkb.healthcare.hospitals">hospitals</a>, prevention through vaccination schedules and Healthier SG screenings, and environmental protection through NEA's inspection and vector-control regimes — all layers of a single public health defence.</p>