How come doctors and nurses don't get sick more often?

Infection Prevention Control

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It seems when one kid is sick at home, everyone gets sick. But in the hospital, it's not just one patient who is sick. It might be 100's of patients. Yet, the doctors and nurses who take care of them don't get sick. They don't suit up like they're going to the moon, but they still usually avoid getting sick.

How come?  

There are very simple rules nurses, doctors, and others follow to keep themselves safe in hospitals.

Otherwise infections could spread fast in hospitals - and hospitals would be places where people got sick, not better.

Some rules are pretty simple

The simplest rule is:

1. Don't touch, unless you need to.

This means:

Don't shake hands with anyone sick. Don't touch your face. Don't touch anything you don't need to. 

2. Wash your hands

This means:

Washing your hands before and after every patient contact.

More rules

There are other rules that specifically let nurses and doctors protect themselves from other diseases. It let's them stay safe when approaching and caring for any patient.

What protection is needed depends on what they are being exposed to  - what parts of the body and what body fluids. Protection also depends on what symptoms or diseases a patient has. How we protect ourselves from a sneeze is different from an itchy skin infection.

These rules need to be followed even before a diagnosis is made.

Symptoms or a suspicion of a disease should trigger precautions. No one should wait for a definitive diagnosis to take precautions and be safe.

For some diseases, more than one rule applies. A virus that causes the cold can be caught from a sneeze or a handshake. Two forms of precaution may be needed.

The 4 sets of Precautions that keep us safe in hospitals:

Universal Precautions for all

For whom? All patients

All patients should be treated as if they have a bloodborne infection - even if they don't and we've tested them. No one should come into bare contact with blood. No one should come in contact with other infectious body fluids - which include: cerebrospinal fluid (CSF) from a lumbar puncture, fluid from joints, lungs, hearts, abdomens (peritoneal space), as well as vaginal secretions, semen, and amniotic fluid during childbirth). Gloves should always be worn for any procedures or exams that may involve blood or these fluids - such as drawing blood, inserting an IV, doing a lumbar puncture. If there is a risk of fluids splashing, there should be eye protection and a mask, as well as gowns if needed (such as for birth). 

  • Universal Precautions actually don't include body fluids other than blood, body fluids containing visible blood, and the infectious body fluids listed above (CSF, amniotic fluid, fluid from lungs, joints, etc). However, it is expected for General Infection Control that precautions, especially gloves, are used for these fluids (nasal secretions, sputum, sweat, tears, urine, breast milk, feces, and vomitus). 
  • These precautions are different from Sterile precautions used for invasive procedures, like surgery, when the rule is to: Use sterile gloves, sterile gown, cap, mask while covering the patient in a full body covering sterile drape.

Contact precautions for infections spread by touching.

For whom? For anyone with symptoms that might be spread by contact. This includes patients with diarrhea, especially if known to be caused by Clostridium difficile, norovirus, and rotavirus. This also includes patients with some skin infections, especially lice and scabies. This can also include some respiratory viruses, like enterovirus and adenovirus, which can spread by sneeze or touch to tabletops, doorknobs, and other objects,which we call fomites (objects that can transfer infections). 

These precautions also may be used for drug resistant organisms, like MRSA (Methicillin-resistant Staphylococcal aureus), CRE (Carbapenem-resistant Enterobacteriaceae), VRE (Vancomycin-resistant Enterococci).

  • Anyone entering a patients room should wear gloves (and a gown).
  • Safe contact precautions depend on safe removal of protective coverings, especially gloves.
  • This helps avoid infections spreading from touching a patient (or a a fomite).

Droplet precautions for infections spread by droplets propelled often by coughing and sneezing (from germs in the nose and sinus down to the lungs) 

For whom? These precautions cover patients with, or with signs or symptoms of: influenza, other respiratory viruses (parainfluenza virus, adenovirus, respiratory syncytial virus (RSV), human metapneumovirus, mumps) and bacteria (whooping cough or pertussis). Other patients - with Neisseria meningitides, group A streptococcus - need these precautions for the first 24 hours of treatment.

  • Don't stand 3-6 feet from a patient. Talking, sneezing, or coughing can send infectious germs 3 feet towards you.
  • Anyone entering the patient's room wears a surgical mask
  • Patients may share a room if someone else has the same infection. Otherwise they are normally isolated.
  • Droplets are smaller, but bigger than 5 microns. That is to say larger 1/200th of a millimeter.

Airborne precautions for diseases that can float in the air across rooms

For whom?  These precautions are needed for tiny germs that cluster in tiny little dollops that let them  float in the air. These little dollops, called nuclei, usually come out when breathing (coughing, sneezing or talking) and can across distances beyond what a simple sneeze can propel germs. Very few infectious germs can do this. Only chickenpox (until lesions crust) or herpes zoster (shingles) in an immunocompromised person or disseminated, measles, and tuberculosis (TB) are generally found in hospitals.

These nuclei are much like droplets, but just tinier. They are normally less than 5 microns - or 1/200th of a millimeter. Sometimes, however, they can be a bit larger. The smaller the nuclei, the deeper the disease can reach down into the lungs.

In limited circumstances, infections can be aerosolized and made airborne. Hantavirus from rodents can be aerosolized by say vacuuming mice bedding or anthrax spores when in powders. Smallpox was - but was eradicated. Tularemia can be aerosolized from say rabbits if maybe a lawn mower destroys a nest.

When healthcare providers do procedures that can create a mist fine droplets of infectious material - such as intubating an influenza patient - they may use airborne precaution masks, as well as goggles to protect themselves, even when influenza is spread largely through droplets that are not aerosolized. The CDC also had recommended special masks be used for H1N1 in 2009.

  • Airborne precautions involve isolating a patient into a separate negative pressure room. Such rooms have the air drawn out and then not redirected into any adjoining rooms or the hallway in order to keep everyone safe. 
  • Patients should travel out of their rooms, if necessary, wearing a mask.
  • Anyone entering the room should wear a special mask, an N-95 mask. These masks can filter out very fine particles. They should be "fit tested" to determine if they will block germs from flowing in. (Those with small faces or facial hair may not have a good enough mask fit).
  • There may be filters with UV (Ultra-Violet) lights to kill the organisms, such as with TB.

Other diseases

Other infections may be spread in different ways. Some may require multiple forms of protection. Enterovirus requires droplet and contact precautions;. Ebola does as well, but it also needs more extensive and fool-proof contact precautions.

Other are not usually spread within hospitals, but can be. Safe needle techniques and blood transfusions are needed to avoid blood-borne infections - like HIV and Hepatitis B - but also for vector-borne infections. Likewise, such vector-borne infections - if prevalent - should lead to bed nets or other precautions, such as in malaria-prone areas in order to avoid mini-outbreaks among patients and staff clustered together. 

Still other diseases may spread by means not associated with direct patient care. Fecal oral transmission can be stopped

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