Infection Prevention and Control Measures

Infection prevention and control comprises the practices that interrupt the spread of pathogens in healthcare and community settings — hand hygiene, precautions matched to how an organism is transmitted, safe device and procedure practices, environmental cleaning, and the programmes that sustain them. These measures are a frontline tool of communicable disease control, protecting patients, workers, and the public from preventable infections.

Definition

Infection prevention and control is the discipline and set of evidence-based practices intended to prevent the transmission of infectious agents to patients, healthcare workers, and others, principally in healthcare settings, through measures that interrupt the chain of transmission.

Scope

This topic surveys the core measures and programme elements of infection prevention and control: standard and transmission-based precautions, hand hygiene, isolation, sterilisation and disinfection, device- and procedure-associated infection bundles, and the organisational components that make a programme effective. It is a reference overview of methods and their evidence base, not clinical guidance for treating an infected patient.

Core questions

• Which routes of transmission do precautions target, and how are precautions matched to them?
• What is the evidence for hand hygiene and other core measures in reducing infection?
• How do care bundles reduce device- and procedure-associated infections?
• What organisational components make an infection prevention and control programme effective?

Key concepts

• Chain of transmission
• Standard precautions
• Transmission-based precautions (contact, droplet, airborne)
• Hand hygiene and the five moments
• Sterilisation and disinfection
• Care bundles for device-associated infection
• WHO core components of IPC programmes

Mechanisms

Infection prevention and control works by breaking the chain of transmission at one or more of its links — the source, the route of spread, and the susceptible host. Standard precautions assume that any patient may be infectious and apply baseline measures such as hand hygiene, personal protective equipment, and safe handling of devices to all care. Transmission-based precautions add measures matched to the route by which a specific organism spreads, whether by contact, droplet, or airborne particles. Hand hygiene interrupts the hands as the principal vehicle of healthcare-associated transmission; sterilisation and disinfection remove pathogens from instruments and surfaces; and bundled practices around invasive devices and procedures reduce associated infections. Sustained effect depends on programme-level components — leadership, education, surveillance, and monitoring — that turn individual measures into reliable everyday practice.

Clinical relevance

Infection prevention and control measures underpin the safety of healthcare delivery and the containment of outbreaks, and they are a shared responsibility across clinical and public-health roles. This entry describes the measures and the evidence supporting them at a population and programme level; it is not a substitute for institutional protocols or for clinical judgement about an individual patient.

Epidemiology

Healthcare-associated infections affect a substantial fraction of hospitalised patients worldwide and contribute to morbidity, mortality, and the spread of resistant organisms. Evidence indicates that core measures such as hand hygiene, when implemented through multimodal programmes, and care bundles for device-associated infections can meaningfully reduce these infections, motivating the WHO's evidence-based recommendations on programme core components.

History

Modern infection prevention traces to nineteenth-century observations by Semmelweis on hand antisepsis and by Nightingale on hospital hygiene, and to the later germ theory and antisepsis of Lister. Formal hospital infection control programmes grew through the twentieth century, and in the 2000s the World Health Organization consolidated global guidance on hand hygiene and, later, on the core components of effective infection prevention and control programmes, embedding the field within wider efforts against healthcare-associated infection and antimicrobial resistance.

Debates

Effectiveness of physical measures against respiratory viruses

Systematic reviews of physical interventions such as masks and hand hygiene for respiratory virus spread report uncertainty, in part because high-quality trials are difficult to conduct and adherence varies, leaving the magnitude of effect for some measures contested even as their biological rationale is accepted.

Key figures

• Ignaz Semmelweis
• Florence Nightingale
• Didier Pittet
• Benedetta Allegranzi

Seminal works

• pittet-2006
• pittet-2009
• storr-2017

Frequently asked questions

What is the difference between standard and transmission-based precautions?

Standard precautions are baseline measures applied to the care of every patient because anyone may carry infectious agents. Transmission-based precautions are additional measures used for patients known or suspected to carry organisms spread by a specific route — contact, droplet, or airborne — and are layered on top of standard precautions.

Why is hand hygiene considered so important in infection control?

Hands are the main vehicle by which pathogens move between patients and surfaces in healthcare settings. Cleaning hands at key moments interrupts this transfer, which is why hand hygiene is a central, evidence-supported measure in infection prevention programmes.