5.3 Vector-Borne, Bloodborne, and Parasitic Pathogens

Pediculosis Capitis (Head Lice) & NASN/AAP Guidelines

Pediculosis capitis (head lice infestation) is a common, non-vector-borne parasitic condition affecting school-aged children. Pediculus humanus capitis is an obligate human parasite residing on the scalp and feeding on blood. Lice do not hop, jump, or fly; transmission occurs almost exclusively through direct head-to-head contact.

Clinical Presentation & Diagnostics

• Diagnosis: Confirmed only by finding live, moving lice on the scalp. The presence of nits (louse eggs cemented to the hair shaft) indicates past or present infestation, but nits located more than 1/4 inch (6 mm) from the scalp are generally non-viable or already hatched.
• Symptomatology: Pruritus caused by an allergic reaction to louse saliva, secondary excoriations, and occasional cervical lymphadenopathy.
• Treatment: First-line treatment includes OTC topical pediculicides: Permethrin 1% lotion or Pyrethrins with piperonyl butoxide. A second treatment is mandatory 7 to 10 days later (ideally on day 9) to kill newly hatched nymphs before they reach reproductive maturity.

NASN & AAP Position Against 'No-Nit' Policies

Historically, schools enforced strict "no-nit" policies, excluding children from school until every single nit was removed. Both the National Association of School Nurses (NASN) and the American Academy of Pediatrics (AAP) take a firm evidence-based position opposing 'no-nit' policies and immediate classroom exclusion:

1. Lack of Transmission Risk: Nits are firmly glued to hair shafts and cannot be transmitted to other students.
2. Unnecessary Absenteeism: No-nit policies lead to excessive school absences, burdening families and causing academic disruption without reducing lice transmission.
3. Management Protocol: If a student is identified with live lice during the school day, the child should remain in class for the remainder of the day, avoiding direct head-to-head contact. Confidential notification is provided to parents at dismissal with treatment instructions. The student may return immediately after the first home pediculicide treatment has been applied.

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Scabies, Ringworm, and Superficial Parasitic/Fungal Conditions

Scabies

Scabies is a persistent skin infestation caused by the microscopic mite Sarcoptes scabiei var. hominis. Mites burrow into the stratum corneum to lay eggs, transmitted via direct, prolonged skin-to-skin contact.

• Clinical Features: Severe, intense nocturnal pruritus accompanied by small papules, vesicles, and characteristic serpiginous burrows in webbed finger spaces, flexor wrist surfaces, axillae, and beltlines.
• Treatment: Topical Permethrin 5% cream applied to the entire body from the neck down (including under fingernails) and left on for 8 to 14 hours before washing off. Retreat in 7 days. All household members and close contacts must be treated simultaneously.
• Exclusion Criteria: Exclude from school until 24 hours after completion of the first full permethrin treatment.

Ringworm (Tinea Corporis)

Tinea corporis is a superficial fungal dermatophyte infection (Trichophyton or Microsporum species) transmitted by direct skin contact or contaminated fomites (wrestling mats, combs).

• Clinical Features: Circular, erythematous, scaly plaque with central clearing and an elevated, active expanding border (annular rash).
• Management & Exclusion: Apply topical antifungal cream (e.g., clotrimazole, miconazole) twice daily. The student may remain in school once topical treatment has commenced, provided the lesion is kept covered with a bandage or clothing during school activities.

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Bloodborne Pathogens & OSHA Compliance in Schools

Bloodborne pathogens of primary concern in school settings are Hepatitis B Virus (HBV), Hepatitis C Virus (HCV), and Human Immunodeficiency Virus (HIV). None of these pathogens are transmitted through casual school contact (air, tears, sweat, saliva, toilet seats, or shared utensils).

Inclusion & Confidentiality

Students with HBV, HCV, or HIV have the right to attend school in regular classroom settings under Section 504 of the Rehabilitation Act and the ADA. Exclusion is prohibited unless a rare exception exists (e.g., severe open, oozing skin lesions that cannot be covered, or uncontrollable biting/bleeding behavior). Health status is strictly confidential under FERPA; disclosure to school staff is limited solely to those with a direct need-to-know to manage emergency care.

OSHA Bloodborne Pathogen Standard (29 CFR 1910.1030)

School districts are mandated to comply with OSHA rules to protect staff from occupational exposure to blood and Other Potentially Infectious Materials (OPIM):

1. Exposure Control Plan (ECP): Written plan updated annually detailing universal precautions, engineering controls (sharps containers, needleless systems), work practice controls, and spill cleanup.
2. Universal / Standard Precautions: Operational policy requiring employees to treat all blood and specified body fluids as if known to be infectious for HIV, HBV, or other bloodborne pathogens.
3. Hepatitis B Vaccination: Must be offered free of charge to all employees with occupational exposure risk within 10 working days of initial assignment.
4. Post-Exposure Evaluation & Prophylaxis: In the event of an exposure incident (needlestick, blood splash to mucous membranes), confidential medical evaluation, baseline testing, and post-exposure prophylaxis (e.g., HIV PEP within 72 hours) must be provided immediately at no cost to the employee.

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Lyme Disease & Tick Removal Protocol

Lyme disease is the most common vector-borne bacterial illness in the U.S., caused by the spirochete Borrelia burgdorferi and transmitted through the bite of infected Ixodes blacklegged ticks (deer ticks). Ticks must typically remain attached for 36 to 48 hours or more before the bacteria can be transmitted.

Clinical Presentation

• Early Localized Stage (3–30 days post-bite): Expanding erythematous rash known as Erythema Migrans (EM), often presenting as a expanding "bullseye" pattern with central clearing. Accompanied by flu-like symptoms (fever, fatigue, headache, myalgias, arthralgias).
• Disseminated Stages: Multiple secondary EM lesions, facial nerve palsy (Bell's palsy), carditis (AV block), and recurrent mono-articular arthritis (most commonly knees).

Evidence-Based Tick Removal Protocol

1. Use clean, fine-tipped tweezers to grasp the tick as close to the skin's surface as possible (target the mouthparts).
2. Pull straight upward with steady, even pressure. Do not twist, jerk, or squeeze the tick, as this can cause the mouthparts to break off or compress the tick's body, forcing infectious fluids into the bite wound.
3. After removal, thoroughly clean the bite area and hands with rubbing alcohol or soap and water.
4. Avoid Unproven Methods: DO NOT apply petroleum jelly, fingernail polish, alcohol, or heat/matches to smother the tick; these methods provoke regurgitation of pathogens into the host.