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A 48-year-old member asked:

is it true that all contagious diseases are not infectious but all infectious diseases are contagious?

3 doctor answers6 doctors weighed in
Dr. Jay Park
Dr. Jay Parkanswered
Pediatrics 50 years experience
The other way around: All infectious diseases are not contagious. By definition, "contagious" means being communicable by contact. For instance, rabies is not transmitted by usual contact with infected patient.
Dr. Michael Ein
Infectious Disease 48 years experience
No: You have it completely backwards. Almost if not all contagious diseases are caused by infectious microorganisms. Many infectious diseases such as e. Coli urinary tract infections are not contagious
Dr. Stephen Scholand
Infectious Disease 23 years experience
Contagious disease: By definition - contagious means you're liable to 'catch' something from someone else. I think of 'the flu', chickenpox, 'meningitis' as good examples of that. (So always good to practice hygiene!). Whereas infectious diseases encompasses all that PLUS other diseases caused by 'germs' that may not necessarily be contagious: for example those deadly amoeba that kill kids every summer, Lyme dz etc.

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Is impetigo contagious?

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Dr. Arthur Torre
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Yes: Since it is a bacterial infection, other children or even adults in contact with the rash can catch impetigo.
A member asked:

Is meningitis contagious?

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Dr. Scott Katz
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Yes: Although some types are more contagious than others, the three most common types of bacterial meningitis all have vaccines available to reduce the risk. There are no vaccines for viral meningitis, but fortunately viral meningitis is typically less serious than bacterial.
A 21-year-old member asked:

How long is a person with diphtheria contagious?

1 doctor answer1 doctor weighed in
Dr. Martin Raff
Infectious Disease 56 years experience
Diphtheria: Transmission is most often person-to-person spread from the respiratory tract and can occur from skin lesions or articles soiled with discharges from lesions of infected persons (fomites). Carriers are usually asymptomatic and may be positive for months. Infected persons may be positive for 2-6 weeks untreated.
A 21-year-old member asked:

Docs, usually how long is scabies contagious after treatment?

1 doctor answer1 doctor weighed in
Dr. Robert Jackson
Dermatology 43 years experience
Wait: I would wait until your doctor says everything is okay.
A 39-year-old male asked:

Is brochitis contagious?

1 doctor answer1 doctor weighed in
Dr. Joel Gallant
Infectious Disease 36 years experience
Cold virus: Since bronchitis is usually caused by a cold virus, you might transmit the cold to someone else. That person may then get a cold, with or without bronchitis.

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Last updated Jan 21, 2016

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