Infectious Disease Risk in EMS
EMS providers face occupational exposure to infectious diseases on a regular basis. Close patient contact, emergency situations that limit time for PPE donning, exposure to blood and body fluids, and work in confined spaces (ambulance patient compartment) all increase risk. Understanding the transmission routes, clinical presentations, and appropriate precautions for common infectious diseases protects both you and the patients you subsequently transport.
Infectious diseases spread through four primary routes: contact (direct touching or indirect via contaminated surfaces), droplet (large respiratory particles that travel 3 to 6 feet), airborne (small particles that remain suspended in air for extended periods), and vector-borne (transmitted by insects). Knowing the transmission route determines the appropriate PPE and precautions.
Tuberculosis (TB)
Tuberculosis is an airborne bacterial infection caused by Mycobacterium tuberculosis. It primarily affects the lungs but can spread to other organs. Patients with active pulmonary TB present with chronic cough (often lasting more than 3 weeks), hemoptysis (coughing up blood), night sweats, weight loss, fever, and fatigue. Risk factors include immunocompromised status (HIV), homelessness, incarceration, immigration from high-prevalence countries, and close contact with known TB cases.
Airborne precautions are required: wear an N95 respirator (not a surgical mask) when caring for patients with suspected TB. Place a surgical mask on the patient to reduce their airborne emissions. If available, transport with ambulance ventilation on high or with windows open. Report suspected TB cases to your infection control officer for follow-up TB skin testing.
Meningitis
Meningitis is inflammation of the meninges (the membranes surrounding the brain and spinal cord), most commonly caused by viral or bacterial infection. Bacterial meningitis is a medical emergency with mortality rates of 10 to 30% even with treatment. The classic triad of symptoms includes fever, severe headache, and nuchal rigidity (stiff neck), though not all patients present with all three. Other findings include altered mental status, photophobia (light sensitivity), nausea, vomiting, and in severe cases, a petechial rash (small purple spots that do not blanch with pressure) suggesting meningococcemia.
Bacterial meningitis (specifically Neisseria meningitidis) is transmitted via respiratory droplets. Wear a surgical mask and have the patient wear one if tolerated. EMS providers who have close contact (within 3 feet for an extended period) with a confirmed meningococcal meningitis patient should receive post-exposure prophylaxis antibiotics (typically ciprofloxacin or rifampin) as directed by public health authorities.
Hepatitis
Hepatitis B (HBV) and Hepatitis C (HCV) are bloodborne viruses that pose significant occupational risk to EMS providers through needlestick injuries and contact with infected blood. Hepatitis B is preventable through vaccination, which is required for all EMS providers. Hepatitis C currently has no vaccine but is curable with antiviral medications. Both can cause chronic liver disease, cirrhosis, and liver cancer.
Protecting Yourself
Prevention strategies include maintaining up-to-date vaccinations (hepatitis B, influenza, COVID-19, tetanus), using appropriate PPE consistently, practicing proper hand hygiene, using sharps containers for needles and blades, cleaning and disinfecting equipment and the ambulance between patients, and reporting all exposures immediately. Know your agency's exposure control plan and post-exposure protocol. If you sustain a needlestick or blood exposure, wash the area immediately, report to your supervisor, and seek medical evaluation within 2 hours. Early post-exposure prophylaxis (PEP) is available for HIV and hepatitis B and is most effective when initiated promptly.