6.2 Immunity and Parasites

Immunity and parasites occupy the rest of the four-question Microbiology block on the 100-item Oregon Barbering Examination, and they are the shop-action half of the same story. Section 6.1 explained what you disinfect. This section explains why the client's body is not a substitute for Division 10 and when you stop the service. HLO still draws the textbook names from Milady's Standard Professional Barbering, 5th Edition (2011) and Pivot Point Barbering Fundamentals, 1st Edition (2018). The Oregon overlay is OAR 817-015-0075 for head lice, ORS 690.005(2) for the cosmetic-not-medical line, and the same high-level / low-level tool rules that Facility Standards will retest on the 90-question laws exam.

Why immunity and parasites matter on the Oregon exams

Immunity is the body's ability to destroy or resist infection. It is not a shop policy. A client who “never gets sick” can still carry hepatitis B virus (HBV). A barber who had chickenpox as a child still has to immerse shears. Oregon tests immunity types because the bulletin lists immunity inside bacteriology. Oregon tests disinfection because Facility Standards is 35 of 90 laws questions. Mixing the two is how a candidate answers “the client is immune, so the razor can wait.”

Parasites are the other trap. Chapter 3 already taught you to recognize tinea, lice, and scabies as hair-and-scalp findings. This chapter classifies them as animal versus plant parasites and maps each class onto an Oregon rule. Recognition without the rule is a histology answer. The rule without the organism is a laws answer. The exam can write either stem.

Natural, acquired, active, and passive immunity

Natural immunity is inherited — a partly inborn resistance to disease. Acquired immunity is developed after the body is exposed to a disease or is vaccinated against it.

Active immunity means the person's own immune system produced the antibodies, either by surviving the disease or by vaccination. It is generally long-lasting. Passive immunity means antibodies were given from another source — for example, a shot of immune globulin, or antibodies a newborn receives from the parent. It is temporary. Do not confuse “passive” with “I don't have to disinfect because I wear gloves sometimes.” Passive immunity is a textbook antibody transfer. It is not a shop exemption.

Immunity does not replace disinfection. OAR 817-010-0068 still requires every tool used in the field of practice to be disinfected or sterilized before each client. OAR 817-010-0008 still requires thorough hand washing immediately before and after each client. A vaccinated barber with natural resistance to one childhood illness still follows high-level rules for razors. A client who just finished a hepatitis B vaccine series still sits in a chair whose implements were processed for the previous client, not for this client's antibody titer.

Animal parasites: lice and scabies

Parasites live off a living host. Barbering textbooks split them into animal parasites and plant parasites (fungi).

Pediculosis capitis is infestation of the hair and scalp with head lice. Lice are insects. Nits (eggs) cement to the hair shaft. The condition is contagious through hats, capes, combs, and head-to-head contact.

Oregon does not treat head lice as an automatic refuse. OAR 817-015-0075 says head lice may be treated at the discretion of the authorization holder. Compliance with OAR Chapter 817, Division 10 Safety and Infection Control Rules and Facility Standards must be observed and followed. That is a two-part rule. Discretion is not a requirement to take the client. Discretion is not a license to skip the comb jar, the cape change, or hand washing. Many Oregon shops still refer lice out because they do not keep a lice protocol, they do not want to occupy a chair with a two-hour comb-out, or their facility policy is a blanket refer. That shop policy is legal. Forcing every shop to refuse is not what the rule says. Treating without Division 10 is a violation.

HLO's practice clarification draws a scope line the theory paper can echo: administering head-lice medication (over-the-counter or prescription) is not itself a cosmetology field of practice. If you shampoo, cut, or style in conjunction with lice work, those acts are barbering or hair design and require authorization. Do not invent a medical lice clinic on a barbering certificate, and do not tell the laws exam that 817-015-0075 is a prescription-drug license.

Scabies is infestation with the itch mite Sarcoptes scabiei. It is an animal parasite that burrows in the skin, causes intense itching, and spreads by prolonged skin contact and shared linens. Scabies is a contagious medical condition. It is not listed in OAR 817-015-0075. Stop the service and refer. Do not shave over burrows. Do not “spot-treat” with a shop tonic. Disinfect or discard anything that touched the client — capes, linens, and tools — under Division 10. A soiled article that has not been cleaned or disinfected for the next client is still soiled under OAR 817-005-0005.

Plant parasites: tinea of scalp and beard

Fungi are the textbook plant parasites. The barber-relevant group is tinea (ringworm) — a contagious fungal infection of skin, scalp, or beard.

• Tinea capitis: ringworm of the scalp. Circular patches, broken hairs, scales. Common in children; can spread on clippers and combs.
• Tinea barbae: ringworm of the beard, historically called barber's itch. Inflamed follicles in the bearded area. A straight-razor shave over tinea barbae is how shops used to spread it from chin to chin.
• Other tinea presentations (body, feet) sit in the same plant-parasite family; they are still contagious fungi, not “dry skin you can powder and fade.”

Tinea is not dandruff. Tinea is not a discretionary lice-style service. It is a contagious medical condition. ORS 690.005(2) limits barbering to cosmetic purposes, not medical diagnosis or treatment of disease. OAR 817-120-0005 requires practice that safeguards public health; prohibited, unsafe, or harmful services can be unprofessional conduct. Stop, do not finish the fade “just around it,” refer to a physician, and put every tool that touched the area through Division 10 — sharps in high-level immersion after clean and rinse (OAR 817-010-0068), clipper blades saturated with high-level disinfectant (OAR 817-010-0069), non-sharps in 1,000 ppm quats or other low-level, linens handled as soiled.

Immunity does not replace disinfection

The four-question microbiology domain can write a clean immunity stem (“acquired immunity is…”) or a mixed stem (“a client who recovered from a staph infection wants a shave”). The mixed stem is the one that fails people who memorized definitions and forgot Oregon. Recovered is not sterile. Vaccinated is not disinfected. Natural resistance is not an EPA-registered tuberculocidal immersion. High-level still means EPA-registered and tuberculocidal (OAR 817-005-0005). Sharps still get that immersion after a soap-and-water clean and a clear rinse. Clipper blades still get saturated. Non-sharps still go in 1,000 ppm quats or another low-level product. Hands still get washed immediately before and after the client.

A Gresham Saturday with four different findings

Priya is working a Saturday in Gresham. Client A has visible nits at the nape. The shop has a written lice policy: refer. That is consistent with OAR 817-015-0075 — discretion includes declining. Client B has circular, scaly broken-hair patches on the crown. That is suspected tinea capitis, not lice. Priya stops, does not put a clipper in the patch, refers, and saturates the blades she already used on the surrounding hair with high-level disinfectant. Client C has itchy burrows on the wrists and waistband line and wants a head shave. That is a scabies-pattern finding, not a discretionary lice service. She stops and refers. Client D says he had a flu shot last month and “can't catch anything.” She still immerses the shears. Four different microbiology facts; four different Oregon actions; all of them can show up as the 4-percent theory items or as Facility Standards and practice-standards items on the laws exam.