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Tuberculosis (TB)


  • What is TB?

    It is caused by organisms of the Mycobacterium tuberculosis complex, including M. tuberculosis, M. bovis and M. africanum. All three of these organisms are capable of causing TB in humans.

    The risk of infection depends upon duration of exposure, the instensity of the exposure, and the immune status of the person exposed. The immune system clears the bacteria immediately in more than 80% of people exposed.

    Latent TB

    In a small proportion of people who have been infected, the bacteria are walled off and remain dormant but viable. This is called latent TB. It is estimated that 5-10% of those with latent TB will develop active TB during their lifetime.

    Active Pulmonary TB

    The most infectious form of TB is pulmonary TB, particularly smear positive cases where TB bacilli can be seen on direct microscopic examination of the sputum. Left untreated, it is estimated that each person with active TB will infect on average between 10 and 15 people each year.

    Closed TB

    Non-pulmonary TB is less common than the pulmonary form and can involve any organ or tissue, most commonly bone, lymph nodes, central nervous system, skin and the genito-urinary tract.

    Multi Drug resistant TB (MDR-TB)

    Sometimes drug-resistant TB occurs when bacteria become resistant to the drugs used to treat TB. This means that the drug can no longer kill the TB bacteria.

    Drug-resistant TB is spread the same way that drug-susceptible TB is spread.

  • Why is this information important?

    If NIAS staff are aware that the patient is potentially symptomatic or a confirmed case of TB then this should be communicated to EAC and ED staff when transferring the patient to ensure effective patient care and management. Early risk assessment for TB ensures staff can use appropriate PPE is worn to prevent staff exposure.

    The IPC Team should be contacted if there is concern regarding a confirmed or suspected case of TB.

  • How is it spread?

    TB bacteria spread through the air from one person to another called an Airborne Route. When a person with TB disease of the lungs or throat coughs, speaks, or sings, TB bacteria can get into the air. People nearby may breathe in these bacteria and become infected.

    When a person breathes in TB bacteria, the bacteria can settle in the lungs and begin to grow.

    From there, they can move through the blood to other parts of the body, such as the kidney, spine, and brain.

    TB disease in the lungs or throat can be infectious. This means that the bacteria can spread to other people. TB in other parts of the body, such as the kidney or spine, is usually not infectious.

    People with TB disease are most likely to spread it to people they spend time with every day. This includes family members, friends, and coworkers or schoolmates.

    TB is NOT spread by

    • shaking someone‚Äôs hand
    • sharing food or drink
    • touching bed linens or toilet seats
    • sharing toothbrushes
    • kissing
  • What are the symptoms of TB?

    Symptoms of TB disease depend on where in the body the TB bacteria are growing.

    TB disease in the lungs may cause symptoms such as:

    • a bad cough that lasts 3 weeks or longer
    • pain in the chest
    • coughing up blood or sputum (phlegm from deep inside the lungs)

    Other symptoms of TB disease are

    • weakness or fatigue
    • weight loss
    • no appetite
    • chills
    • fever
    • sweating at night

    Symptoms of TB disease in other parts of the body depend on the area affected.

    People who have latent TB infection:

    • do not feel sick,
    • do not have any symptoms, and
    • cannot spread TB to others.
  • IPC Precautions
    • Hand Hygiene should be completed as per the 5 moments in line with usual practice.
    • Eye protection should be worn
    • FFP3 Mask should be worn
    • Gloves and Aprons should be worn.
    • The patient should be transported via ambulance with no other patients present.
    • The patient should be asked to wear a Fluid Resistant Surgical Mask unless there is concern about MDR-TB which should be discussed with the IPC team.
    • All equipment and the ambulance should have a deep clean paying particular attention to touch points.
    • Laundry should be treated as contaminated, placed into an alginate bag and placed into a red laundry bag.
  • Do staff need any prophylaxis or follow up?

    You may have been exposed to TB bacteria if you spent time near a patient with active pulmonary TB disease or closed TB if the area is exposed such as an open wound / surgical site. Follow-up of contacts is determined by whether appropriate PPE was used and what type of TB you have been exposed to.

    If you believe you have been in contact with a known case of TB contact your line manager immediately and the IPCT at the earliest convenience who will complete a risk assessment.

    No Follow-up is required of contacts where appropriate PPE was used.

    Follow-up of contacts where appropriate PPE was not used:

    If you were exposed to a patient with a confirmed Pulmonary TB or to closed TB where the site is open such as a surgical site then you should contact your line manager and the IPC team when next on duty.

    It is important to note that there is no immediate risk to staff and no action immediate staff follow up is required out of hours.

    It is important to know that a person who is exposed to TB bacteria is not able to spread the bacteria to other people right away. Only persons with active TB disease can spread TB bacteria to others.

    Following a risk assessment you may be asked to contact Occupational Health for follow up which may include a blood test, chest x-ray and BCG check.

    The IPC team can be contacted for further advice. The team will be able to help staff risk assess the patient and precautions required and to provide support where required.