Nutritional Anaemia - Park's Textbook of Preventive and Social Medicine

Definition

"A condition in which the haemoglobin content of blood is lower than normal as a result of a deficiency of one or more essential nutrients, regardless of the cause of such deficiency."

• Park's Textbook of Preventive and Social Medicine, p. 738

Diagnosis of Anaemia - WHO Cut-off Points (Table 12)

• Hb 10-11 g/dl = Early anaemia
• Hb < 10 g/dl = Marked anaemia
• MCHC < 34% indicates hypochromic red cells, seen in iron deficiency anaemia

Stages of Iron Deficiency

1. First stage - Decreased storage of iron with no other detectable abnormalities (serum ferritin falls).
2. Second stage (Latent iron deficiency) - Iron stores exhausted but anaemia has not yet occurred. Serum ferritin is low; transferrin saturation falls from normal 30% to less than 15%. This is the most widely prevalent stage in India.
3. Third stage (Overt iron deficiency / Iron deficiency anaemia) - Decrease in circulating haemoglobin due to impaired haemoglobin synthesis. Full picture of anaemia.

Evaluation of Iron Status

The Problem - Magnitude

World

• Nearly two-thirds of pregnant women in developing countries
• About one-half of non-pregnant women in developing countries
• Even in developed countries, an estimated 4-12% of women of child-bearing age have anaemia

India

• Women in the reproductive age group (15-49 years)
• Children (6-35 months)
• Low socio-economic strata

• 72.7% of children up to 3 years in urban areas are anaemic
• 81.2% of children up to 3 years in rural areas are anaemic
• Prevalence increased from 74.2% (1998-99) to 79.2% (2005-06)
• Bihar had the highest prevalence (87.6%), Nagaland the lowest (44.3%)
• Adolescent girls: prevalence 72.6% (DLHS 2002-04); severe anaemia was 21.1%
• 19% of maternal deaths in India are attributable to anaemia

Aetiology / Causes

1. Inadequate intake or poor bioavailability of dietary iron. Although diets may contain seemingly adequate amounts of iron, less than 5% is absorbed from the gut. Poor bioavailability is a major reason for widespread iron deficiency.
2. Excessive losses of iron from the body - especially in women due to menstrual losses, repeated pregnancies at close intervals, and blood loss during delivery.

• Malaria and hookworm infestations - major parasitic contributors to anaemia
• Women who have closely-spaced pregnancies become anaemic due to the combined demands of pregnancy and blood loss at each delivery
• Megaloblastic anaemia (due to folate/B12 deficiency) occurs in pregnant women from poor income groups; sub-clinical folate deficiency found in ~30% of pregnant women in rural North India

Detrimental Effects

• Increases risk of maternal and foetal mortality and morbidity
• 19% of maternal deaths in India are due to anaemia
• Associated with abortions, premature births, postpartum haemorrhage, and low birth weight

• Anaemia can be caused or aggravated by parasitic diseases (malaria, intestinal parasites)
• Iron deficiency impairs cellular immune responses and increases susceptibility to infection
• Other functional disturbances: impaired cell-mediated immunity, reduced resistance to infection, increased morbidity and mortality

• Even mild anaemia causes significant impairment of maximal work capacity
• The more severe the anaemia, the greater the reduction in work performance and productivity
• Major economic consequence for developing countries

Interventions and Management

Initial Assessment

• Hb < 10 g/dl (Severe): High-dose iron or blood transfusion may be necessary; refer to nearest PHC
• Hb 10-12 g/dl: Medical interventions below

(1) Iron and Folic Acid Supplementation

• Mothers (pregnant/lactating): One tablet daily containing 100 mg elemental iron (300 mg ferrous sulphate) + 0.5 mg folic acid. Continue 2-3 months after Hb returns to normal to replenish stores. Repeat Hb estimation every 3-4 months.
• Children (6-60 months): Liquid formulation; 20 mg elemental iron (60 mg ferrous sulphate) + 0.1 mg folic acid daily for 100 days. Screening at 6 months, 1 year, and 2 years.
• Children 6-10 years: 30 mg elemental iron + 250 mcg folic acid per day for 100 days.
• Adolescents: Same dosage and duration as adults.

(2) Iron Fortification

• Studies at the National Institute of Nutrition, Hyderabad showed that adding ferric ortho-phosphate or ferrous sulphate with sodium bisulphate effectively fortified salt with iron.
• When iron-fortified salt was consumed for 12-18 months, it significantly reduced the prevalence of anaemia.
• The Government of India accepted iron fortification of salt as a public health strategy; commercial production started in 1985.
• Advantage over supplementation: Salt is universally consumed, so all segments of the population benefit.

(3) Other Strategies

• Changing dietary habits - increasing intake of iron-rich and iron-absorption-enhancing foods
• Control of parasites (hookworm, malaria control)
• Nutrition education

National Nutritional Anaemia Prophylaxis Programme

• Launched during the Fourth Five Year Plan
• Distribution of iron and folic acid (Folifar) tablets to pregnant women and young children (1-12 years)
• Implemented through MCH Centres (urban), Primary Health Centres (rural), and ICDS projects
• Technology for iron-fortified salt developed at National Institute of Nutrition, Hyderabad

Anaemia Mukt Bharat Programme

• Increasing birth weight
• Reducing both IMR and MMR
• Community-based events promoting behaviour change for maternal and child nutrition
• Convergence with ICDS/Anganwadi centres for delivery of services

Summary Table

• Park's Textbook of Preventive and Social Medicine, pp. 720, 738-739

Anaemia Mukt Bharat (AMB) Programme

Background and Launch

The Problem it Addresses

• 72.7% of children under 3 years in urban areas are anaemic; 81.2% in rural areas
• Anaemia accounts for 19% of maternal deaths in India
• Prevalence in adolescent girls: 72.6% (DLHS 2002-04)
• Affects women in reproductive age (15-49 yrs), children, and low socio-economic groups

Six Target Beneficiary Groups

1. Children under 5 years (6 months to 5 years)
2. Children 6-10 years (school-going children)
3. Adolescents (10-19 years) - both girls and boys
4. Pregnant women
5. Lactating mothers
6. Women in Reproductive Age Group (WRA, non-pregnant)

Six Key Interventions

1. Prophylactic Iron and Folic Acid (IFA) Supplementation

2. Deworming

• Biannual deworming with Albendazole 400 mg, six months apart
• Targets helminth/intestinal worm infestation which contributes to anaemia
• Delivered through the National Deworming Day and school-based platforms
• Deworming is linked with WIFS in adolescents (through the school health programme)

3. Intensified Year-Round Behaviour Change Communication (BCC) Campaign

• Diet diversity
• Increased quantity/frequency
• Fortified foods
• Harnessing locally available resources

• Delayed cord clamping is associated with decreased risk of anaemia and intraventricular haemorrhage in newborns

4. Testing and Treatment of Anaemia Using Digital Methods

• Point-of-care testing (digital Hb estimation) with emphasis on:
  • Pregnant women
  • School-going adolescents
• Ensures early identification and prompt treatment
• Moderate/severe anaemia cases referred to appropriate health facilities

5. Mandatory Provision of IFA-Fortified Foods in Government-Funded Programmes

• Iron and folic acid fortified foods made mandatory in:
  • Mid-Day Meal (MDM) Programme
  • ICDS (Integrated Child Development Services)
  • PDS (Public Distribution System)
  • Other government public health nutrition programmes
• Fortification of salt with iron (ferric ortho-phosphate or ferrous sulphate with sodium bisulphate) - technology developed at the National Institute of Nutrition, Hyderabad; commercial production began in 1985

6. Intensifying Awareness, Screening and Treatment of Non-Nutritional Causes of Anaemia

• Malaria - causes or aggravates anaemia
• Haemoglobinopathies (e.g., sickle cell disease, thalassaemia)
• Fluorosis - endemic in parts of India

Six Institutional Delivery Mechanisms (Platforms)

1. Anganwadi Centres (AWCs) - through ICDS, for children under 6 and pregnant/lactating women
2. Primary Health Centres (PHCs) / Sub-Centres - for rural beneficiaries
3. Schools - for school-going children (6-19 years) through WIFS and school health programmes
4. Health and Wellness Centres / ASHA - for community outreach and adolescent services (ARSH clinics)
5. Village Health and Nutrition Days (VHNDs) - monthly at Anganwadi centres
6. MCH Centres and Government Hospitals - for pregnant/lactating women and treatment of moderate/severe anaemia

Weekly Iron and Folic Acid Supplementation (WIFS) - Key Component

• Target: Adolescent girls and boys (10-19 years); covers 10.25 crore adolescents across India
• Dose: 100 mg elemental iron + 500 mcg folic acid, once weekly on a fixed day (supervised)
• Long-term goal: Break the intergenerational cycle of anaemia
• Short-term benefit: Nutritionally improved human capital
• Rolled out in 32 states and UTs under NIPI; covered ~3 crore beneficiaries by December 2013
• Linked with: biannual deworming, dietary counselling, and screening for moderate/severe anaemia

National Iron Plus Initiative (NIPI) - The Parent Strategy

• Life-cycle approach - continuous age-specific and dose-specific IFA supplementation
• Covers all vulnerable age groups from infancy through reproductive age
• AMB is implemented in all villages, blocks, and districts of all States/UTs of India through existing NIPI and WIFS delivery platforms

Focus on First 1,000 Days (Poshan Abhiyaan Context)

• 9 months of pregnancy
• 6 months of exclusive breastfeeding
• Period from 6 months to 2 years

• Increase birth weight
• Reduce both IMR and MMR
• Consolidate gains through intervention up to age 3 years
• Further interventions for children 3-6 years through Anganwadi platforms (for overall development)

Summary: The 6x6x6 Framework at a Glance

• Park's Textbook of Preventive and Social Medicine, p. 756 (Anaemia Mukt Bharat Strategy)

QDENGA Vaccine (TAK-003)

What is QDENGA?

Vaccine Platform / Mechanism

• Type: Recombinant chimeric, live-attenuated vaccine
• Backbone: Uses an attenuated DENV-2 virus as a genetic backbone (unlike Dengvaxia which uses the Yellow Fever 17D platform)
• Construction: The structural protein genes (prM and E) of DENV-1, DENV-3, and DENV-4 are individually inserted into the attenuated DENV-2 backbone, creating four chimeric viruses that together make up the tetravalent formulation
• This design means DENV-2 proteins are expressed from the "native" component while the other three serotypes are expressed as chimeras - which explains why efficacy against DENV-2 is consistently higher than against other serotypes

Schedule and Administration

Approved Indications / Regulatory Status

Key Clinical Trial: TIDES (Tetravalent Immunization against Dengue Efficacy Study)

• Phase 3, randomized, double-blind, placebo-controlled trial (DEN-301)
• Conducted in >28,000 volunteers across 13 countries in dengue-endemic and non-endemic areas
• Participants aged 4-16 years; programme overall studied ages 18 months to 60 years
• Duration: 7 years of follow-up (now the longest-studied dengue vaccine trial; completed November 2025)

Efficacy Results (Pooled / TIDES)

Immunogenicity

• Induces neutralizing antibodies against all 4 DENV serotypes
• High seropositivity rates particularly for DENV-2
• Antibody responses sustained at least 3 years after vaccination (systematic review, 2025 - PMID: 40195054)
• Both seropositive and seronegative recipients mount measurable immune responses

Safety Profile

Comparison with Dengvaxia (CYD-TDV)

Important Limitations and Ongoing Questions

1. DENV-3 in seronegatives: A very small signal of potentially increased hospitalization risk after DENV-3 infection was observed in seronegative recipients - under continued scrutiny
2. DENV-4: Insufficient DENV-4 cases occurred during TIDES to fully characterize serotype-4 efficacy
3. DENV-2 dominant efficacy: The DENV-2 backbone architecture means anti-DENV-2 immunity is most robust; questions remain about balanced protection across all 4 serotypes, especially in seronegative individuals - noted by Harrison's 2025
4. Co-administration: Studies confirm it can be co-administered with 9-valent HPV vaccine (El Hindi et al. Vaccine, 2025)
5. Travelers: Can be considered for use in travelers going to endemic areas, but no FDA approval yet for this indication; EU/EMA approved

WHO Recommendations

• Introduction recommended in settings with high dengue transmission intensity to maximize public health benefit while minimizing potential risk in seronegative individuals
• Post-market surveillance ongoing globally
• Aligns with the existing National Iron Plus Initiative (NIPI) analogy: targeted deployment where burden is highest

Real-World Effectiveness

Summary Box

• Harrison's Principles of Internal Medicine 22E (2025), p. 1722
• Dermatology 2-Volume Set 5e, p. 1729
• Systematic Review: Naderian et al., Rev Med Virol, 2025 - PMID 40195054
• Takeda 7-year TIDES data, November 2025

Disaster Management

Definition of Disaster

• Loss of life, injury, or other health impacts
• Property damage
• Loss of livelihoods and services
• Social and economic disruption
• Environmental damage

Types of Disasters

A. Natural Hazards

1. Geophysical - Earthquakes, volcanoes, tsunamis, mass movement (dry)
2. Hydrological - Floods, mass movement (wet), wave action
3. Climatological - Extreme temperature, drought, wildfire
4. Meteorological - Storms, cyclones
5. Biological - Epidemics, insect infestations, animal incidents

B. Human-Induced Disasters

• Examples: Bhopal Gas Tragedy (Dec 3, 1984) - methyl isocyanate leak, Union Carbide Pesticide Plant, ~3,000 dead, 2 million exposed
• Chernobyl nuclear accident (April 26, 1986) - largest accidental release of radioactive material; deposited >7 million curies of iodine-131, caesium-134/137, strontium-90 across the northern hemisphere

• Long-term chemical/radiation exposure (nuclear factories, labs releasing radioactive substances into air/soil/water)
• Global warming (greenhouse effect) - from burning fossil fuels
• Ozone layer depletion - chlorofluorocarbons

• Since WWII: ~127 wars, 21.8 million war-related deaths, >50% civilians
• Chemical, Biological, Radiological, Nuclear (CBRN) disasters

Disaster Management - Definition

"The systematic process of using administrative decisions, organizations, operational skills and capacities to implement policies, strategies and coping capacities of the society and communities to lessen the impacts of natural hazards and related environmental and technological disasters."

• Avoid (prevention)
• Limit (mitigation and preparedness)

Three Fundamental Aspects of Disaster Management

1. Disaster Response
2. Disaster Preparedness
3. Disaster Mitigation

1. Disaster Impact and Response

Search, Rescue and First Aid

• After a major disaster, the need for search, rescue and first aid is so great that organized relief services can meet only a small fraction of demand
• Most immediate help comes from uninjured survivors
• Most injuries are sustained during the impact - greatest need for emergency care in the first few hours

Field Care

• Most injured persons converge spontaneously to health facilities using available transport
• Health service resources must be redirected to this new priority
• Maximize bed availability and surgical services
• Provisions for food and shelter
• Establish a centre to respond to inquiries from patient's relatives
• Priority to victim identification; provide adequate mortuary space

Triage

Triage consists of rapidly classifying the injured on the basis of the severity of their injuries and the likelihood of their survival with prompt medical intervention.

• Triage should be carried out at the site of disaster to determine transport priority
• Reassessment occurs on arrival at hospital/treatment centre
• Higher priority is granted to victims whose immediate or long-term prognosis can be dramatically affected by simple intensive care
• Moribund patients requiring enormous attention with questionable benefit have the lowest priority
• Persons with minor/moderate injuries should be treated at home to avoid draining resources
• Seriously injured should be transported to hospitals with specialized treatment facilities

Tagging

• Name, age, place of origin
• Triage category
• Diagnosis
• Initial treatment given

Care of the Dead

• Care of the dead is an essential part of disaster management
• Large numbers of dead can also impede rescue activities
• Steps: (1) Removal from scene → (2) Shift to mortuary → (3) Identification → (4) Reception of bereaved relatives
• Health hazards from cadavers are minimal if death was from trauma
• Bodies may contaminate water sources in floods, potentially transmitting gastroenteritis or food poisoning
• The dead bodies represent a delicate social problem

2. Relief Phase

• Treatment of casualties
• Prevention of communicable diseases

• Food, blankets, clothing, shelter
• Sanitary engineering equipment and construction material

1. Acquisition of supplies
2. Transportation
3. Storage
4. Distribution

3. Epidemiologic Surveillance and Disease Control

1. Overcrowding and poor sanitation in temporary resettlements → acute respiratory infections
2. Population displacement → introduction of communicable diseases (migrant or indigenous populations may lack immunity)
3. Disruption and contamination of water supply, damage to sewerage and power systems
4. Disruption of routine control programmes (funds/personnel diverted to relief work)
5. Ecological changes favouring vector breeding and increased vector population density
6. Displacement of domestic and wild animals carrying zoonoses (leptospirosis, rickettsiosis, rabies, equine encephalitis)
7. Emergency food, water and shelter from new sources may themselves be sources of infection

• (a) Implement public health measures as soon as possible to reduce disease transmission risk
• (b) Organize a reliable disease reporting system to identify outbreaks and initiate control measures
• (c) Investigate all reports of disease outbreaks rapidly

Vaccination Policy After Disasters

• Mass vaccination requires large numbers of workers who could be better employed elsewhere
• Poor supervision of sterilization and injection techniques may cause more harm than good
• Mass vaccination creates a false sense of security and leads to neglect of effective control measures

4. Rehabilitation

Rehabilitation starts from the very first moment of a disaster.

Water Supply

• Survey all public water supplies (distribution system + source)
• Priority: chlorination (residual chlorine 0.2-0.5 mg/litre)
• Low water pressure increases risk of pollutant infiltration into water mains
• Protection measures for water sources: restrict access (fencing/guard), ensure safe excreta disposal at safe distances, prohibit upstream contamination activities

Food Safety

• Poor hygiene is the major cause of food-borne disease in disaster situations
• Kitchen sanitation is of utmost importance in shelters/camps
• Monitor personal hygiene of food handlers

Basic Sanitation and Personal Hygiene

• Prompt attention to excreta disposal and personal hygiene
• Defecation fields at safe distance from living areas, water sources, and food preparation areas

5. Disaster Mitigation in Health Sector

• Flood mitigation works
• Appropriate land-use planning
• Improved building codes
• Reduction or protection of vulnerable populations and structures

• Ensuring safety of health facilities
• Ensuring continuity of public health services (water supply, sewerage systems)

6. Disaster Preparedness

Why Community Preparedness is the Cornerstone

Eight Key Tasks of the National Preparedness System

1. Evaluate the risk of the country or region to disaster
2. Adopt standards and regulations
3. Organize communication, information and warning systems
4. Ensure coordination and response mechanisms
5. Adopt measures to ensure financial and other resources are available and can be mobilized
6. Develop public education programmes
7. Coordinate information sessions with news media
8. Organize disaster simulation exercises that test response mechanisms

Policy Development in Disaster Preparedness

1. Communication
2. Health
3. Social welfare
4. Police and security
5. Search and rescue
6. Transport

7. Man-Made Disasters - Public Health Response

• Tighter regulations of chemical plants and hazardous facilities
• Build chemical plants away from densely populated areas
• Appropriate engineering and technological measures (building codes, dam designs, containment of toxic materials)
• Early warning systems
• Protection against human errors

8. Disasters in India

• Bhopal Gas Tragedy (1984) - world's worst industrial disaster
• Odisha Super Cyclone (29 Oct 1999)
• Gujarat Earthquake (~16,480 deaths)
• Indian Ocean Tsunami (Dec 2004, >200,000 deaths)
• J&K Earthquake (7.4 RS, 2,100 dead, 30,000 injured)
• Uttarakhand cloudburst/floods, Kedarnath (June 2013, ~5,748 dead)
• Kashmir valley floods (2014)

Institutional Framework in India

Personal Protection Measures - General Rules (for all emergencies)

• Do not use the telephone except to call for help (keep lines free for emergency response)
• Listen to radio and media for official updates
• Follow official instructions given over radio or loudspeaker
• Keep a family emergency kit ready

Summary: The Disaster Management Cycle

• Park's Textbook of Preventive and Social Medicine, pp. 898-903