Definition of infectious in English:

infectious

adjective

  • 1(of a disease or disease-causing organism) likely to be transmitted to people, organisms, etc., through the environment.

    • ‘Glandular fever is an infectious illness that causes swelling of the lymph nodes.’
    • ‘MPs poured out of the Commons potentially spreading any infectious agent.’
    • ‘The cull of a flock of 9,000 pheasants was under way yesterday after confirmation of a highly infectious bird disease.’
    • ‘Mumps is highly infectious and spreads rapidly in susceptible people living in close proximity.’
    • ‘The classic means of protecting persons exposed to infectious diseases is vaccination.’
    • ‘Unravelling the genetic and environmental determinants of infectious disease will soon be feasible.’
    • ‘This cross sectional survey was not designed to provide direct evidence of transmission of infectious diseases in prison.’
    • ‘Severe acute respiratory syndrome is highly infectious and potentially lethal.’
    • ‘Bone lesions from infectious disease or parasitic infection are rare.’
    • ‘Molecular biology has had a major impact on medical microbiology and infectious disease.’
    • ‘Must my rejected bag secretly be destroyed to prevent the spread of infectious agents?’
    • ‘Lyme disease is an infectious illness caused by the bacterium Borrelia burgdorferi.’
    • ‘It was thought that close contact with an infected person was needed for the infectious agent to spread from one person to another.’
    • ‘However, conjunctivitis caused by the common cold is very infectious and can spread rapidly between people.’
    • ‘What if I tell myself the rash will go away and it becomes infectious and spreads even further?’
    • ‘He was taken to the infectious diseases hospital three days later.’
    • ‘Measles is highly infectious and could spread very quickly.’
    • ‘Clean bathroom surfaces also help prevent the spread of infectious germs.’
    • ‘Against this background, the emergence of new human infectious diseases or viruses is unsurprising.’
    • ‘Our feeling, however, is that they most likely contain a single infectious capsid.’
    • ‘However, the bacteria are not as infectious as the common cold and cannot be spread by casual contact.’
    • ‘There are also some major infectious diseases for which vaccinations have not been developed.’
    contagious, communicable, transmittable, transmissible, transferable, conveyable, spreadable, spreading
    View synonyms
    1. 1.1Likely to spread infection.
      ‘the dogs may still be infectious’
      • ‘Those treated can support their families and are likely to be less infectious.’
      • ‘Dutch botanist Martinus Bijerinck called this infectious fluid contagium vivum fluidum.’
      • ‘A person with glandular fever is most infectious when they have a fever (high temperature).’
      • ‘Some of the cheapest meat is stripped by machines and high-pressure jets from the bone, which is likely to be highly infectious in a sick cow.’
      • ‘She was misdiagnosed with gastro-enteritis, and transferred to Castle Hill because it was felt she was infectious.’
      • ‘By the way, colds spread through touching infectious surfaces or inhaling viruses.’
    2. 1.2Likely to spread or influence others in a rapid manner.
      ‘her enthusiasm is infectious’
      • ‘The problem is once you fall for the guy with the infectious laugh or the girl that takes your breath away, you have to get them to notice you.’
      • ‘A most pleasant man, his naturally friendly manner and infectious good humour have made him a popular member of the Ship's Company.’
      • ‘It does make you an energetic person, and one who has an infectious and personable manner.’
      • ‘Your enthusiasm is infectious; it spreads as rapidly through conversations as it does through bloodlines.’
      • ‘Not only that, but it's the infectious happiness of the manner, with the very sterile, factual detailing of demise that is the content.’
      • ‘His quick wit and absolutely infectious laugh are almost as entertaining as the show itself.’
      • ‘Poverty is something that is contagious and infectious in our community.’
      • ‘The balance of chilly remove and infectious abandon that Morton conveys adds much to Morvern's allure.’
      • ‘He grinned slowly, an infectious smile that soon spread, spanning ear to ear.’
      • ‘Neville Garden communicated his own infectious enthusiasm, week after week for many years, through his work as a critic.’
      • ‘Nevertheless, she understands the essence of the formula, and applies it in a manner that is infectious.’
      • ‘Valencians don't simply watch fireworks - they almost commune with them and the feeling is infectious.’
      • ‘The author's enthusiasm and infectious desire to communicate his ideas comes across loud and clear.’
      • ‘His infectious enthusiasm for technology is spread through his weblog.’
      • ‘He had a wonderful sense of humour and an infectious, hearty laugh.’
      • ‘She had a warm personality combined with a loud infectious laugh.’
      • ‘The dog had an infectious energy, a boisterous nature, that spread wherever he bounded.’
      • ‘Seeing Chris thrashing around his drum kit made Steven smile and the infectious smile spread to Donnie.’
      • ‘Long had he been plagued by an infectious fear of spreading weakness in times that demanded strength.’
      • ‘Darlene simply had the kind of infectious positive attitude that influenced everyone in her presence.’

Usage

On the differences in meaning between infectious and contagious, see contagious

Pronunciation:

infectious

/inˈfekSHəs/