Attack rate

In epidemiology, the attack rate is the proportion of an at-risk population that contracts the disease during a specified time interval.^[1] It is used in hypothetical predictions and during actual outbreaks of disease. An at-risk population is defined as one that has no immunity to the attacking pathogen, which can be either a novel pathogen or an established pathogen. It is used to project the number of infections to expect during an epidemic. This aids in marshalling resources for delivery of medical care as well as production of vaccines and/or anti-viral and anti-bacterial medicines.^[2]

The rate is arrived at by taking the number of new cases in the population at risk and dividing by the number of persons at risk in the population.^{[citation needed]}

{\mbox{attack rate}}={\frac {\mbox{number of new cases in the population at risk}}{\mbox{number of persons at risk in the population}}}

References

^ "Principles of Epidemiology Lesson 3 - Section 2". Centers for Disease Control and Prevention. 10 December 2019. Archived from the original on 17 April 2020. Retrieved 7 April 2020.
^ Glaser, Anthony N. (April 1, 1995). High-Yield Biostatistics. Baltimore: Williams & Wilkins. ISBN 978-0-683-03566-7.

External links

The International Biometric Society
The Collection of Biostatistics Research Archive
Guide to Biostatistics (MedPageToday.com) Archived 2012-05-22 at the Wayback Machine

Concepts in infectious disease

Determinants

Agent	Infectivity Infectious dose Pathogenicity Attack rate Virulence Endotoxin Exotoxin Case fatality rate Antimicrobial resistance
Host	Susceptible individual Burn Diabetes Immune response Immunodeficiency Immunosuppression Postoperative Opportunistic infection Risk of infection
Environment	Access to water, sanitation and hygiene Climate change El Niño Tropical diseases Commerce Deforestation Ecology Humidity Injection drug use Natural disaster Flood Poultry and livestock Poverty Travel Vector control War and conflict

Transmission

Basic concepts	Asymptomatic carrier Chain of infection Fomite Host Incubation period Index case Infectious period Latent period Natural reservoir Opportunistic infection Subclinical infection Super-spreader Window period
Modes	Human-to-human transmission Horizontal Vertical Cross-species transmission Spillover infection Vector Zoonosis Reverse zoonosis Breakthrough infection
Routes	Air Blood Food Feces Fomite Hospital Mosquito Sex Tick Water
Modelling	Attack rate Basic reproduction number Compartmental models in epidemiology Critical community size Force of infection Herd immunity Infection rate Serial interval
Occurrence levels	Cluster Endemic Epidemic Holoendemic Hyperendemic Incidence Mesoendemic Outbreak Pandemic Prevalence Sporadic Syndemic

Prevention and
Control measures

Pharmaceutical	Antibiotic Antifungal Antimicrobial Antiseptic Antiviral Immunization Immunotherapy Monoclonal antibody therapy Inoculation Phage therapy Pre-exposure prophylaxis Post-exposure prophylaxis Repurposed drugs Vaccination efficacy/effectiveness booster resistance
Non-pharmaceutical	Contact tracing Cordon sanitaire Disease surveillance Disinfection Hygiene Food hygiene Hand washing Gloves Isolation Lockdown Protective sequestration Public health Quarantine Respiratory source control Surgical mask PPE Safe sex Sanitation Screening Social distancing Sterilization Travel restrictions Vector control