Diseases, Conditions, Syndromes

How measles, whooping cough, and worse could roar back

The availability of safe, effective COVID vaccines less than a year into the pandemic marked a high point in the 300-year history of vaccination, seemingly heralding an age of protection against infectious diseases.

Obstetrics & gynaecology

Fetal defense: Study reveals early immune protection in the womb

Research from Duke-NUS Medical School has revealed that fetuses are not as defenseless as once thought; they can actually fight infections from within the womb. This new understanding could significantly change the way doctors ...

Diseases, Conditions, Syndromes

Game theory offers a new approach to pandemic responses

With flu season upon us and coronavirus a persistent threat, Dartmouth researchers propose a new way of thinking about masking and social distancing rules that is more responsive to what people feel is necessary at a given ...

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Infectious diseases, also known as contagious diseases or transmissible diseases, and include communicable diseases, comprise clinically evident illness (i.e., characteristic medical signs and/or symptoms of disease) resulting from the infection, presence and growth of pathogenic biological agents in an individual host organism. In certain cases, infectious diseases may be asymptomatic for much or all of their course. Infectious pathogens include some viruses, bacteria, fungi, protozoa, multicellular parasites, and aberrant proteins known as prions. These pathogens are the cause of disease epidemics, in the sense that without the pathogen, no infectious epidemic occurs.

Transmission of pathogen can occur in various ways including physical contact, contaminated food, body fluids, objects, airborne inhalation, or through vector organisms. Infectious diseases that are especially infective are sometimes called contagious and can be easily transmitted by contact with an ill person or their secretions. Infectious diseases with more specialized routes of infection, such as vector transmission or sexual transmission, are usually regarded as contagious but do not require medical quarantine of victims.

The term infectivity describes the ability of an organism to enter, survive and multiply in the host, while the infectiousness of a disease indicates the comparative ease with which the disease is transmitted to other hosts. An infection is not synonymous with an infectious disease, as some infections do not cause illness in a host.

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