Public health interventions do not operate in isolation. They are embedded within governance systems, financing mechanisms, organisational hierarchies, and policy environments. This chapter examines how interventions are structured, implemented, and sustained across local, national, and international levels.

It explores programme design, delivery platfor…

Environmental health practice bridges epidemiology, toxicology, regulation, and risk communication. It addresses how air, water, soil, radiation, chemicals, occupational settings, and the built environment influence population health.

This chapter explores exposure assessment, risk assessment frameworks, hazard identification, dose–response relationships…

Population screening aims to detect disease before symptoms arise, shifting intervention earlier in the disease pathway. However, screening is not inherently beneficial; it requires careful evaluation of evidence, test accuracy, disease prevalence, and potential harms.

This chapter examines principles of screening, including sensitivity, specificity, pre…

Infectious disease control remains one of the foundational pillars of public health. From historical epidemics to modern global outbreaks, communicable diseases test surveillance systems, laboratory networks, vaccination programmes, and international cooperation.

This chapter explores disease transmission dynamics, reproduction numbers, case definitions,…

Non-communicable diseases (NCDs) - including cardiovascular disease, cancer, chronic respiratory disease, and diabetes - are now the leading causes of global mortality. Unlike acute infectious outbreaks, NCDs emerge from long-term exposure to behavioural and environmental risk factors.

This chapter explores the epidemiology of NCDs, shared risk factors s…

Health needs assessment is a foundational public health function. It bridges epidemiology, ethics, economics, and policy by systematically identifying unmet health needs within populations and guiding strategic planning.

This chapter explores epidemiological assessment, patterns of health inequality, demographic profiling, burden of disease analysis, and…

Prisons represent closed environments in which existing social and health inequalities are intensified. Incarcerated populations often experience higher rates of mental illness, substance dependence, infectious diseases such as tuberculosis and HIV, chronic disease, and trauma histories.

This chapter explores the epidemiology of prison health, including …

Forced migration - including refugees, asylum seekers, and internally displaced persons - represents one of the defining humanitarian and public health challenges of our time. Conflict, political persecution, environmental disaster, and structural instability displace millions globally.

This chapter explores the epidemiology of displacement, including in…

Population ageing is one of the most profound demographic transformations of the 21st century. Increased life expectancy, declining fertility, and improved survival from infectious diseases have expanded the proportion of older people in many societies.

This chapter examines longevity trends, compression of morbidity, chronic disease burden, dementia, mu…

Disability is not solely a medical condition; it is the interaction between health states and social environments. This chapter explores the epidemiology of disability across the life course, including physical, sensory, intellectual, and psychosocial impairments.

It examines ageing-related disability, childhood developmental disability, injury-related i…