Time between a primary case having symptom onset and a secondary case having symptom onset.

University of Michigan - Ann Arbor

Infectious diseases are caused by pathogenic microorganisms, such as bacteria, viruses, parasites, or fungi. The diseases can be spread, directly or indirectly, from person to person. 

Infectious Disease

Centers for Disease Control and Prevention. (n.d.). Centers for Disease control and Prevention. Centers for Disease Control and Prevention. https://www.cdc.gov/. 

Centers for Disease Control and Prevention

Pandemic refers to a new infectious disease that spread worldwide. A pandemic is not the same as an epidemic as the disease spreads beyond a select community or region. The World Health Organization (WHO) is responsible for declaring when a global pandemic is occurring by monitoring outbreaks of disease and receiving advice from international health experts. 


Pandemic

"A case definition is a set of standard criteria for classifying whether a person has a particular disease, syndrome, or other health condition. "

Definition of Case Definition

“Cluster refers to an aggregation of cases grouped in place and time that are suspected to be greater than the number expected, even though the expected number may not be known”

Cluster Transmission Definition

Serial Interval Definition

$\frac{number of new cases among contacts}{total number of contacts}$ 


Secondary Attack Rate Definition

- PubMed
- Lumen Learning
- Textbooks
- WHO
- The Gulf of Mexico: A "Hot Zone" for Tropical Diseases?
- Centers for Disease Control and Prevention
- Human Rickettsialpox, Southeastern Mexico
- The SARS-CoV-2 crisis and its impact on neglected tropical diseases: Threat or opportunity?
- National Institute of Allergy and Infectious Diseases
- A Handful Of ‘Antipoverty’ Vaccines Exist For Neglected Diseases, But The World’s Poorest Billion People Need More
- Pregnancy Associated Arbovirus Infections
- Covid-19: Implications for People with Chagas Disease

References for Infectious Disease

- Vector-Borne Diseases
- Arboviruses Causing Pregnancy Associated Infections
- Neglected Tropical Diseases
- Zoonotic Diseases

Categories of Infectious Diseases



The flu is a contagious respiratory illness caused by influenza viruses and infects the nose, throat, and lungs. Some people, such as older people, young children, and people with certain health conditions, are at a higher risk of serious complications.  The two main types of the flu are Types A and B, which are routinely spread in people and  responsible for the seasonal flu epidemics that occur each year.

Seasonal Influenza (Flu) 

The study of the incidence, prevalence, and distribution of illness or disease in a given population

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