Infection-control CER
Do now
Students write a CER recommending an infection-control plan supported by chain-of-infection evidence.
- Hand in
- CER naming the highest-priority infection-control intervention, citing chain-of-infection and patient-context evidence, predicting the expected effect, and stating assumptions and limitations.
- Where
- Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not.
You get two school days for every day you were absent, so this deadline moves with you.
For your case, can you write a claim that names one priority control, explains the mechanism by which it cuts infection, and predicts how much risk drops?
Students write a CER recommending an infection-control plan supported by chain-of-infection evidence.
- • Write a CER with a clear control claim and chain-based evidence.
- • State the expected effect and at least one limitation.
- What are the four parts of a CER (hint: claim, then three more)?
- Why is predicting the expected effect stronger than just saying an intervention will help?
- 1State a claim naming the highest-priority control for the scenario.
- 2Cite evidence from the chain of infection and the patient context.
- 3Explain reasoning that links the control to interrupted .
- 4Predict the expected effect on infection risk if the control is applied.
- 5Identify assumptions and limitations affecting the recommendation.
What did this day actually feel like?
Infection-control CER
A CER naming the highest-priority control, citing chain-of-infection and patient-context evidence, and reasoning through how the control interrupts transmission.
He was specific that this is not a list of hygiene tips. It has to name a mechanism, predict an outcome, and admit uncertainty. "Wash your hands more" is not an argument. "Hand hygiene between these two specific tasks interrupts the transmission link because of this, and here is what I cannot rule out" is one.
Turned in: CER → Claim Evidence Reasoning folder, plus the unit package
Fiction. There is no such student. The lessons, labs and dates are the real planned course; the student, the classmates and the conversations are invented.
The same day, drawn.
Wash your hands more is not an argument. Name the mechanism, predict the outcome, admit what you cannot rule out.
Fiction. There is no such student. The lessons, labs and dates are the real planned course; the student, the classmates and the conversations are invented.
🛠 Get unstuck · pick your level
🔑 Today's words · 5
Tap a word in the lesson for a plain meaning and one example. Recycled into next week's Do-Now.
Do the work · 80-minute blockfirst 5 min = hook▸
💡 Big idea: An infection-control CER earns trust because it names the mechanism, predicts an outcome, and states its assumptions, so anyone can test whether the control actually works.
- 0-8 minReview Wednesday case analysis; confirm highest-priority chain link and proposed control.
- 8-20 minWrite the claim: one sentence naming the highest-priority infection-control intervention.
- 20-42 minWrite evidence: cite chain link, patient context, and -route data.
- 42-60 minWrite reasoning: link each evidence point to the claim and predict the expected effect.
- 60-72 minAdd assumptions and limitations section.
- 72-80 min: confirm claim is specific, prediction is present, limitation is stated.
- • Yesterday you found the weakest link; today you write the formal argument for why your control is the right choice.
- • The prediction section is what separates a CER from a case summary: you must say what you expect to happen.
- • WebXam 072110 Biotechnology strand tests causal reasoning, not just factual recall.
- • Name your assumption explicitly: if it turns out to be wrong, your recommendation may also be wrong.
- • The highest-priority control is the one that breaks the most vulnerable or most accessible link in the chain.
- • Predicting the expected effect requires reasoning from mechanism, not just assertion.
- • Every control plan has assumptions; stating them is the difference between a recommendation and a claim.
Unit 3.1 Nosocomial Nightmare: Hospital-acquired infections, chain of infection, pathogens, immune response, infection control. · Infection-control CER
Day 4 of this lesson. Open this exact section in myPLTW (find it in Clever, Microsoft sign-in), then do the work below.
Do this: Open myPLTW and find the Lesson 3.1 Nosocomial Nightmare infection-control recommendation or CER activity to use as a writing scaffold.
Submit any platform prompts before shifting to independent CER writing.
Platform prompts done in first 15 minutes; full CER complete before end of period.
Submitted CER on the class site, or hand it to Mr. Mendoza in class is the primary evidence.
The official PLTW activity stays inside myPLTW. If myPLTW will not open, use F1 and E1-E3 on this page to complete today's local evidence decision, then make up the official activity when access returns. Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not.
Check things off as you work, then submit. This tells Mr. Mendoza how you're doing so he can help the class. It does not replace turning in your producible through the submission route shown below.
Use the code Mr. Mendoza gave you, not your name. Saved on this device.
Unit 3.1 Nosocomial Nightmare: Hospital-acquired infections, chain of infection, pathogens, immune response, infection control. · Infection-control CER
Open myPLTW and find the Lesson 3.1 Nosocomial Nightmare infection-control recommendation or CER activity to use as a writing scaffold.
Platform prompts done in first 15 minutes; full CER complete before end of period.
This is how Mr. Mendoza sees the class keeping pace with PLTW. Be honest, it only helps if it is accurate.
🎯 Students write a CER recommending an infection-control plan supported by chain-of-infection evidence.
- State a claim naming the highest-priority control for the scenario.
- Cite evidence from the chain of infection and the patient context.
- Explain reasoning that links the control to interrupted .
- Predict the expected effect on infection risk if the control is applied.
- Identify assumptions and limitations affecting the recommendation.
CER: CER naming the highest-priority infection-control intervention, citing chain-of-infection and patient-context evidence, predicting the expected effect, and stating assumptions and limitations.
Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not. Use the checklist just below and upload by 11:29 PM for full credit. Absent with an excused absence? You get two school days for every day you were absent, so this deadline moves with you.
| Task | Who |
|---|---|
| State a claim naming the highest-priority control for the scenario. | _______ |
| Cite evidence from the chain of infection and the patient context. | _______ |
| Explain reasoning that links the control to interrupted . | _______ |
| Predict the expected effect on infection risk if the control is applied. | _______ |
| Identify assumptions and limitations affecting the recommendation. | _______ |
Working solo? Put your own name in "Who" for every row.
- Write a CER with a clear control claim and chain-based evidence.
- State the expected effect and at least one limitation.
- 1Do thisStudents write a CER recommending an infection-control plan supported by chain-of-infection evidence.
- 2Use this resource
- 3Submit thisCER: CER naming the highest-priority infection-control intervention, citing chain-of-infection and patient-context evidence, predicting the expected effect, and stating assumptions and limitations.
- 4Submit it here
- 1Open the drop folder.
- 2Sign in with your district Microsoft account, not a personal one.
- 3Upload the file, named Lastname_Firstname__Assignment Title.
- 4Your own upload panel says Uploaded with a green check: that is your receipt.
Turn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not. Principles of Biomedical Technology (Principles of Biomedical Science) › Unit 3.1 Nosocomial Nightmare: Hospital-acquired infections, chain of infection, pathogens, immune response, infection control. › CEROpen the drop folder
Learn it · deck, reading, and vocabulary▸
The deck carries the prior idea forward, lets you inspect an analogy, maps the rule to biology, and ends with the same evidence decision and exit ticket used on this page.
Generated from this lesson's canonical data with a red-team citation check.
You must locate the single weakest link in a specific case before prescribing a control, because a targeted fix aimed at the real weak point works while a general hygiene tip cannot be tested or aimed.
An infection-control CER earns trust because it names the mechanism, predicts an outcome, and states its assumptions, so anyone can test whether the control actually works.
Wet footprints appear across connected rooms after one person enters from the rain.
- Which footprint came first?
- Which rooms connect?
- What pattern would support more than one entry point?
Patterns across time and connection can narrow a explanation without proving it by themselves.
People change behavior, infections have periods, and surveillance data can be incomplete.
- • Footprints map to recorded cases.
- • Room connections map to exposures.
- • The route hypothesis maps to a limited claim.
Driving question: For your case, can you write a claim that names one priority control, explains the mechanism by which it cuts infection, and predicts how much risk drops?
What you already know: You must locate the single weakest link in a specific case before prescribing a control, because a targeted fix aimed at the real weak point works while a general hygiene tip cannot be tested or aimed.
New idea: An infection-control CER earns trust because it names the mechanism, predicts an outcome, and states its assumptions, so anyone can test whether the control actually works.
Visual or model: F1. F1. A lesson illustration or teaching diagram for Infection-control CER. Use it with E1-E3; it is a model or context image, not experimental or patient data. What to notice: Trace the labeled observation or evidence sequence before choosing an explanation.
- Observe or measure the relevant feature in Infection-control CER.
- Organize the observation with a stable evidence ID.
- Apply this rule: Patterns across time and connection can narrow a explanation without proving it by themselves.
- Choose the option the evidence supports and state the limit of the conclusion.
Real biomedical example: For your case, can you write a claim that names one priority control, explains the mechanism by which it cuts infection, and predicts how much risk drops?
What the evidence supports: E1-E3 and F1 support the daily take-home when the response meets the stated success criteria.
What it cannot prove: The package does not support claims beyond this lesson's or any real patient diagnosis.
- • nosocomial: Describes an infection that a patient catches while in a hospital or healthcare setting rather than bringing it in from outside.
- • : A microorganism such as a bacterium, virus, fungus, or parasite that can cause disease in its host.
- • vector: A that delivers genetic material into a cell, such as a or virus, or an organism like a mosquito that spreads a disease.
- • reservoir: A living host or environment where a normally lives and multiplies, serving as the source from which infections spread.
- • : The passing of a disease-causing agent from one host to another, by routes such as contact, droplets, contaminated objects, or vectors.
- • : The body's coordinated defense against a harmful invader, in which immune cells recognize, attack, and remember the threat.
- • PPE: Personal protective equipment, the gear like gloves, goggles, lab coats, and masks worn to shield the body from chemical, biological, or physical hazards.
- • : Describing techniques that keep an area free of harmful microbes so cultures and patients are not contaminated.
Use it now: Choose one decision option. Cite E1 and E3, then explain how the rule connects the evidence to your choice.
Go further, optional: The source links below are optional enrichment. Every fact required for today's local evidence decision appears in this lesson package.
The highest-priority control is the one that breaks the most vulnerable or most accessible link in the chain.
Limit: E1 supplies context or an observation; it does not by itself establish the explanation.
An infection-control CER earns trust because it names the mechanism, predicts an outcome, and states its assumptions, so anyone can test whether the control actually works.
Limit: E2 is a teaching statement or comparison and must be checked against the task evidence.
Write a CER with a clear control claim and chain-based evidence.
Limit: E3 supports only the result or product criterion named here; it cannot justify a broader clinical or causal claim.
PLTW-PBT-2026-11-13 · Simulated classroom evidence scenario
Your role: biomedical investigator
Decision: Your team must decide what the evidence from Infection-control CER supports before submitting the claim-evidence-reasoning response named on the lesson page.
- • Choose the strongest supported explanation.
- • Choose the next evidence to collect.
- • Hold the decision because the evidence is insufficient.
Response: State one choice, cite at least two evidence IDs, explain the rule that connects them, and add one limitation. Submit it as the claim-evidence-reasoning response.
Claim ceiling: The supplied lesson evidence can support an observation, pattern, classroom mechanism, or next-step decision about Infection-control CER. It cannot by itself prove causation, establish a real clinical diagnosis, or justify action outside this classroom task.
Reason for review: Your team must decide what the evidence from Infection-control CER supports before submitting the claim-evidence-reasoning response named on the lesson page.
Context: A scientific recommendation names a mechanism, predicts a result, and states its own assumptions, so it can be tested and trusted.
- • T1: State a claim naming the highest-priority control for the scenario.
- • T2: Cite evidence from the chain of infection and the patient context.
- • T3: Explain reasoning that links the control to interrupted .
- • T4: Predict the expected effect on infection risk if the control is applied.
- • T5: Identify assumptions and limitations affecting the recommendation.
- • E1: The highest-priority control is the one that breaks the most vulnerable or most accessible link in the chain.
- • E2: An infection-control CER earns trust because it names the mechanism, predicts an outcome, and states its assumptions, so anyone can test whether the control actually works.
- • E3: Write a CER with a clear control claim and chain-based evidence.
Measurements: Use only the measurements, units, graph, or counts supplied in today's task. No additional patient measurement is implied.
Figure finding: Teaching diagram for Infection-control CER. Trace the labeled observation or evidence sequence before choosing an explanation. This is a teaching model, not patient or experimental data.
Uncertainty: This is a composite classroom scenario. Missing history, measurements, or confirmation tests remain unknown and limit the conclusion.
Rate or percent = part / comparison total x 100%. Percent change = (new - comparison) / comparison x 100%.
If 18 of 60 records meet a condition, the frequency is 18 / 60 x 100% = 30%.
Name the comparison total. A percent describes the supplied group and does not automatically predict an individual's outcome.
Use today's supplied counts to calculate one rate, risk, frequency, or percent change. Show the denominator and interpretation.
Students often think Students think the reasoning section just restates the claim in more words.. The trap: Reasoning is not repetition, because a claim tells you what to do while reasoning explains the mechanism of why breaking that link cuts infection. If your reasoning could be deleted without losing information, you wrote a restatement, not a mechanism.
Claim: The highest-priority control for this cafeteria outbreak is a stay-home rule that keeps any food handler with vomiting or diarrhea out of the kitchen until 48 hours after symptoms stop.
Evidence: The chain trace showed norovirus spreading through the reservoir link, when one food handler who worked while sick shed virus onto serving utensils and ready-to-eat trays. From there the mode of transmission was fecal-oral contact through contaminated food, and the susceptible hosts were students whose only shared exposure was the lunch line. Handwashing and surface cleaning matter, but the sick worker was the source feeding the whole chain, and staff scheduling is a link the school controls directly.
Reasoning: Removing an infected reservoir shuts off the supply of new agent before it can ever reach a portal of entry. If no sick handler touches the food, there is nothing for handwashing or cleaning to catch up on later, so this breaks the chain at its source rather than trying to intercept virus that has already spread across trays and hands. Norovirus is shed in very high amounts and stays contagious for about two days after symptoms end, so a 48-hour exclusion targets the exact window when a returning worker is still a reservoir.
Expected effect: If the stay-home rule is enforced, foodborne transmission events of this type should drop sharply, because the single pathway in this scenario ran through food touched by an infected handler.
Assumptions and limitations: I assume the sick handler was the true source and that workers will report symptoms honestly rather than come in for a paycheck. If the virus actually entered through a contaminated food shipment or a sick student touching a shared drink station, exclusion alone would not be enough, and we would need to target a different link such as the mode of transmission or the portal of entry.
This model shows the level of evidence and organization needed to complete: Models the infection-control argument on a different scenario (a norovirus outbreak in a school cafeteria): a claim, evidence, and reasoning paragraph that names the highest-priority control, ties it to a specific link in the chain of infection, predicts its effect, and states assumptions. Use it to see the format and depth, then build your own argument for your assigned case.
- Write one defensible claim.
- Choose specific evidence that supports the claim.
- Explain the scientific rule that connects the evidence to the claim.
Keep the structure. Replace the question, facts, measurements, and evidence. Then recheck units, vocabulary, and whether the conclusion goes beyond the evidence.
Also due today: Submit your CER on the class site, or hand it to Mr. Mendoza in class before the end of the period.
- CER:
- Claim, Evidence, Reasoning: make a claim, back it with evidence, explain your reasoning.
- SOP:
- Standard Operating Procedure, the exact steps to follow (especially in a lab).
- Tracker:
- Your PLTW progress log where you record completed evidence.
- myPLTW:
- The PLTW course site where you do the online activities. Find it in Clever with your Microsoft sign-in, right next to Schoology.
Tap the speaker to hear a term. Add two of these to your notebook glossary with a definition and an example in your own words.
Pick just 2 or 3 words from today and make them yours: write what each one means in your own words, name the context clue or evidence that helped, then give one example from what you actually did in Infection-control CER. Try your own words first; the glossary is there if you get stuck. This is voluntary and counts as extra credit, so keep it short.
Saved on this device. Show Mr. Mendoza or add these to your notebook glossary to claim the extra credit.
Hand-picked readings and interactives for this lesson, from authoritative open organizations and PLTW's own public course outline.
Check yourself · commit, then reveal▸
Claim ceiling for this check: The supplied lesson evidence can support an observation, pattern, classroom mechanism, or next-step decision about Infection-control CER. It cannot by itself prove causation, establish a real clinical diagnosis, or justify action outside this classroom task.
A student writes: 'We should disinfect the shared cuff (claim). The cuff moved between patients (evidence). Disinfecting the cuff is a good idea (reasoning).' What is wrong with the reasoning, and how do you fix it?
Write an answer and pick a confidence to unlock the key.
Fast retrieval with instant answers, not the commit-then-reveal check above. Try each from memory first: write what you remember about the earlier units, then check yourself here.
Go further and get help▸
What today's skills lead to. These are real health-science careers this course builds toward. Tap one to see, on the US Department of Labor's O*NET site, what the job actually involves, what it pays, and how fast it is growing.
Today is individual work you can do from home: complete the same target above, then submit your CER.
Open the drop folderTurn this in at the drop folder with your district Microsoft sign-in, or hand it to Mr. Mendoza in class. Both count as submitted. Doing the activity in myPLTW does not.
Class still runs. Complete the online activity above (it's self-guided). Need the concept taught without a teacher? Use this authoritative explainer:
CDC: infection control basics and the chain of infectionYou've passed Unit 2, so the optional extra-credit track is open. Complete reserved-unit work from home, including virtual labs, for extra credit. Each item shows its correct submission route.
Open the extra-credit track- CompleteEvery required part of the artifact is present, nothing left blank.
- AccurateThe science and the data are correct and match the evidence.
- Scientific reasoningYou explain your claim with evidence and reasoning (CER), not just an answer.
- Professional communicationClear, organized, labeled, and written the way a clinician or scientist would.
- SubmittedTurned in the right way, on the class site or handed to Mr. Mendoza in class, and confirmed. Not in Schoology: that is where the report-card grade appears later.