Capstone: an infection prevention plan

This lesson brings the course together by building an infection prevention plan for an invented workplace: Birch Lane Dental, a community dental clinic with eight operatories, a sterilization room, a front desk and waiting room, and 24 staff. The clinic sees about 90 patients a day, including children and older adults, and also runs a weekly outreach clinic at a seniors' residence. The clinic, its staff and its numbers are invented for teaching. The same structure works for a tattoo studio, a school, a long-term care home, a cleaning contractor or an office; only the details change.

The structure of a plan

A good infection prevention plan is not a binder on a shelf. It is a short, practical document that answers seven questions, backed by procedures, training and records:

• What infection hazards do we have, where and in which jobs? (hazard inventory and risk assessment)
• What controls do we use, from most to least effective? (controls by the hierarchy)
• How do we protect people who are susceptible? (vaccination and fitness for work)
• What do we do when something goes wrong? (exposure response, spills and outbreaks)
• Who does what? (roles and responsibilities)
• How do people learn it? (training and competence)
• How do we know it works, and how do we keep improving? (monitoring, records and review)

Step 1: hazard inventory and risk assessment

The clinic's team, including a dentist, two hygienists, a dental assistant, the reprocessing technician, the office manager and the joint committee worker member, walks through the clinic and lists tasks, hazards and who is exposed. They rate each hazard by likelihood and severity before controls, using a simple scale from 1 (low) to 5 (high), then list existing controls.

# Rank Birch Lane Dental's hazards by risk score = likelihood x severity (invented ratings)
hazards = [
    ("procedures: spatter and aerosols", 5, 3),
    ("instrument handling: sharps", 4, 4),
    ("sterilization failure", 2, 5),
    ("front desk: respiratory", 4, 2),
    ("operatory turnover: surfaces", 4, 2),
    ("outreach clinic", 3, 4),
    ("waste handling", 2, 4),
]
ranked = sorted(hazards, key=lambda h: h[1] * h[2], reverse=True)
for name, likelihood, severity in ranked:
    score = likelihood * severity
    band = "high" if score >= 15 else "medium" if score >= 8 else "low"
    print(f"{score:>2} {band:<6} {name}")

16 high   instrument handling: sharps
15 high   procedures: spatter and aerosols
12 medium outreach clinic
10 medium sterilization failure
 8 medium front desk: respiratory
 8 medium operatory turnover: surfaces
 8 medium waste handling

The ranking guides priorities, but it is a judgment aid, not a precise measurement. Sterilization failure scores in the middle because it is unlikely, yet its severity is so high, potentially exposing hundreds of patients, that the team decides to treat it as a top priority anyway. Risk matrices should never be used to ignore low-likelihood, high-severity hazards.

Step 2: controls by the hierarchy

For each hazard, the team records controls from most to least effective, noting what is already in place and what needs to be added.

Step 3: vaccination and fitness for work

The clinic's vaccination section lists the vaccines recommended for dental staff: hepatitis B with post-vaccination antibody testing, MMR or proof of immunity, varicella immunity, Tdap, annual influenza and COVID-19 vaccination according to current guidance. The office manager keeps confidential immunization records separate from personnel files, offers vaccines at no cost or arranges them through occupational health, and documents informed declinations. The policy explains that non-immune staff may be excluded from work after exposures, such as to measles, as public health directs.

The fitness-for-work policy says staff with fever, vomiting, diarrhea or new respiratory symptoms stay home and report the absence, without penalty. Birch Lane pays for up to six sick days a year, more generous than Ontario's three unpaid days under the Employment Standards Act, and does not require a doctor's note for short absences. Staff with conditions that might affect patient safety, such as an infected cut on the hand, report to the clinic lead for a case-by-case decision.

# Checking staff immunity records before the outreach clinic (invented data)
staff = {
    "Asha":  {"hep_b_protected": True,  "measles_immune": True,  "flu_this_season": True},
    "Ben":   {"hep_b_protected": True,  "measles_immune": False, "flu_this_season": True},
    "Chloe": {"hep_b_protected": False, "measles_immune": True,  "flu_this_season": False},
    "Dev":   {"hep_b_protected": True,  "measles_immune": True,  "flu_this_season": False},
}
for name, rec in staff.items():
    gaps = [k for k, ok in rec.items() if not ok]
    print(f"{name}: {'ready' if not gaps else 'follow up: ' + ', '.join(gaps)}")

Asha: ready
Ben: follow up: measles_immune
Chloe: follow up: hep_b_protected, flu_this_season
Dev: follow up: flu_this_season

Step 4: exposure, spill and outbreak response

The response section has three short procedures posted in the sterilization room and staff room:

• Blood exposure: wash or flush, report to the clinic lead, go immediately to the hospital emergency department or occupational health clinic named in the plan, ideally within two hours; the clinic lead assesses the source patient's consent to testing and records the incident; the office manager reports to WSIB as required.
• Spills: use the spill kit in each operatory hallway; absorb, clean, disinfect for the contact time and dispose of waste as biomedical waste where heavily soaked.
• Outbreaks: if two or more staff have similar illness within a short period, or public health reports an exposure linked to the clinic, the clinic lead contacts the local public health unit and follows its direction.

A sterilization failure procedure is added because of the high severity score: stop using the affected sterilizer, quarantine and recall instruments processed since the last passed biological indicator, call the service company, consult the professional college or public health about patient notification if instruments were used, and document every step.

Step 5: roles and responsibilities

Step 6: training and competence

Every new staff member completes orientation on the plan, routine practices, hand hygiene, sharps safety, spill response and exposure reporting before working with patients, plus job-specific training: reprocessing for the technician, operatory turnover for assistants and screening for front desk staff. Clinical staff practise putting on and taking off protective equipment and are observed doing it. Everyone repeats the core training every year, and the clinic adds short refreshers when procedures change or audits find gaps. Training records list the date, content and trainer.

Step 7: monitoring, records and review

The plan sets a few measurable indicators and reviews them at monthly staff meetings and in a full annual review with the joint committee:

• hand hygiene audits in operatories each month, reported with sample sizes and confidence intervals;
• fluorescent marker audits of operatory turnover each month;
• sterilizer logs and biological indicator results, checked weekly by the clinic lead;
• sharps injuries and blood exposures, each investigated within a week;
• staff immunization coverage by vaccine;
• staff illness absences, watched for clusters;
• actions from inspections, audits and incidents, tracked to completion.

The annual review also checks the plan against current guidance and law, evaluates safer devices with front-line staff, updates the hazard inventory for new procedures or equipment, and records what changed and why. Reviewing the plan after any significant incident or outbreak, not just once a year, keeps it current.

Adapting the plan to other workplaces

The same seven-part structure scales up or down. A small office's plan might be two pages focused on stay-home policies, ventilation, hand hygiene, cleaning of shared surfaces and an outbreak contact. A tattoo studio's plan centres on single-use items, sterilization monitoring, bloodborne exposure response and public health rules for personal service settings. A long-term care home's plan is much larger, with formal surveillance, outbreak management with public health and detailed precautions for residents. In every case, the plan starts with a real look at the work and the people, uses the hierarchy of controls, prepares for things going wrong and checks whether it works.