Back-to-School Germ Readiness: A Proactive Infection Prevention Guide for K-12 Schools

During the summer, schools across the country prepare for the year ahead by ordering supplies, finalizing class rosters, training staff and getting classrooms ready for students to return. But amid all that planning, one important item should be on every back-to-school checklist: germ readiness. Back-to-school season is not just a logistical reset. It is also a time when germs can spread quickly as students and staff return to shared spaces, close contact and daily routines. The decisions schools make before the first day can help shape the health of the entire school community for months to come.

Why back-to-school is a critical reset moment

When hundreds of students return to shared spaces after a summer apart, they bring with them a diverse mix of pathogens they’ve encountered from travel, camps, family gatherings, and community exposure. Combine that with the density of a classroom, shared surfaces, and close contact, and you have near-ideal conditions for infectious disease to spread quickly.

The downstream effects are real and measurable. Absenteeism climbs among students and staff, which means families and learning are impacted.¹ When teachers and support staff are out, learning continuity breaks down, which can be deeply impactful to communities. The good news, though, is that K–12 schools that invest in proactive infection prevention and control measures before the school year begins are significantly more resilient once respiratory virus season hits. In short, a little bit of prevention goes a long way, and even more so when it’s done early.

What schools are up against: common pathogens

So where do we start? It can seem overwhelming, but we’ve got you covered with a clear strategy for knowing what germs you’re likely going to see and the strategies to get ahead of them.

Here’s a practical overview of what tends to circulate in K–12 environments:

• Respiratory viruses are the most common culprit for illness throughout the school year. Influenza and common cold viruses, like rhinovirus, enterovirus, and adenovirus, spread easily through respiratory droplets and contaminated surfaces.² Other respiratory viruses can cause significant illness in infants and older adults, like respiratory syncytial virus (RSV). There are also seasonal coronaviruses and COVID-19, which can cause serious illness even in healthy people. Prevention of these is vital as the Centers for Disease Control and Prevention (CDC) estimate that every year, at least one million people are hospitalized and more than 70,000 people die from respiratory viral illness.³
• Gastrointestinal pathogens, particularly norovirus, are a nightmare for administrators, students and staff alike. Norovirus is a highly contagious stomach bug that is the leading cause of vomiting, diarrhea and foodborne illness in the United States. It spreads rapidly in group settings and can take down an entire classroom, office or department in a matter of days.
• Bacteria of concern are often overlooked but are an important part of infection prevention as they include skin pathogens like Staphylococcus aureus (including MRSA, which is particularly relevant in athletics environments where skin-to-skin contact and shared equipment are common). There is also Streptococcus, the culprit behind strep throat outbreaks that can ripple through entire grade levels.

The Key Takeaway: Schools are high-touch, high-density environments where many types of germs can easily circulate simultaneously. Because transmission routes vary (hands, surfaces, respiratory droplets), no single intervention is sufficient; Rather, an additive approach is required.

Where risk lives: high-touch surfaces and shared spaces

Here’s something I tell every school team I work with: germs are invisible, so surfaces that look clean are often still contaminated. When you’re thinking of high-touch surfaces and objects, consider what you touch in the course of an hour, morning, and entire day – how often are we cleaning them? Here are a few to consider:

• In classrooms: desks, chairs, shared supplies, doorknobs and sink faucets are obvious culprits, but teacher desks and computers are often the most heavily contaminated items in the room.⁴ It makes sense when you think about it. Teachers touch most surfaces in the classroom and throughout the school and interact with large numbers of staff and students. Additionally, custodians typically clean and disinfect high-touch surfaces/objects but won’t clean electronic devices, thus leaving a significant, and largely invisible, pathogen reservoir untouched.
• Restrooms: faucets, flush handles, door handles, counters and paper towel dispensers remain perennial high-risk areas.
• Cafeterias and multipurpose rooms see enormous surface turnover across hundreds of students. Athletics environments are frequently overlooked but have a lot of high-risk areas, as shared mats, balls and locker rooms create ideal conditions for bacteria like MRSA, but also stomach bugs like norovirus.
• Buses and other common areas: handrails, seats, driver areas, and shared items like books, are often cleaned less frequently than classroom spaces despite heavy use.

The bottom line: Germs live in the everyday and often overlooked areas that we often assume are clean.

Breaking the chain of infection in schools

Risk reduction is additive, so infection prevention works best when it’s layered. No single measure is a silver bullet but combining behavioral and environmental approaches creates a much more effective and resilient system.

• Hand hygiene remains the first and most powerful line of defense. This means structured routines, not reminders, can help make it a habit that sticks. Students and staff should clean their hands upon arrival, before meals, after restroom use, and after coughing or sneezing. Building these moments into not only the daily schedule but also daily habits, rather than relying on individual initiative, dramatically improves compliance.
• Respiratory etiquette and illness awareness matter too. Clear expectations about staying home when sick and covering coughs and sneezes are critical. Schools that communicate these norms consistently to students, families, and staff see better adherence.
• Environmental hygiene is the layer that protects everyone, even those who don’t follow hand hygiene or respiratory etiquette. It’s important to remember this distinction — cleaning and disinfecting are not the same thing. Cleaning removes soil and organic matter from a surface. Disinfection kills the germs that remain. Both steps are necessary, and they are not interchangeable. Skipping cleaning and going straight to disinfection means the product is working against a bioburden it may not be able to overcome.

Cleaning best practices for K–12 schools

The truth is that not all cleaning is the same. There’s an important difference between end-of-day custodial cleaning and the in-between, teacher-mediated cleaning that happens throughout the school day. Both matter.

Custodial teams are critical partners in maintaining baseline hygiene, but they can’t be everywhere at once. Teachers and school staff play an essential role in managing high-touch surfaces throughout the day, especially during this back-to-school season and periods of peak illness (like flu season), when frequency should increase. A recent research study assessing community-level flu rates found that they can be used to predict student absenteeism in schools during respiratory virus season.⁵ Using this information as a prompt to increase cleaning/disinfection and reinforce reminders about respiratory etiquette can help get ahead of things.

Training and support should extend beyond custodians. Teachers and administrators need clear protocols, too - not a one-time orientation, but ongoing education and helpful reminders. These efforts should also include proper product use because knowing the required contact time, understanding product compatibility with surfaces, and reading label directions determines success. A disinfectant that’s wiped off in 10 seconds when the label requires two minutes of wet contact time cannot be effective.

Product selection matters. When choosing disinfectants for school use, look for EPA-registered products with demonstrated efficacy against the pathogens most relevant to school settings (like flu, norovirus, rhinovirus, etc.). In busy classroom environments, the easier a product is to use correctly, the more likely it will be used correctly, which is why clear label claims and straightforward directions are essential. Ready-to-use (RTU) disinfectant wipes, such as [Clorox Disinfecting Wipes](/products/clorox/clorox-disinfecting wipes/) or Clorox EcoClean Disinfecting Wipes for hard, nonporous surfaces and Clorox Screen+ Sanitizing Wipes for electronic devices, are a practical option for teachers who do not have time to mix solutions or wait for sprays to settle.

What “success” looks like

Infection prevention in schools isn’t glamorous, but it is guaranteed to help reduce illness for everyone. The results are visible when it works: fewer students missing school, fewer staff out sick, fewer outbreaks that derail instruction and operations. With these strategies in place, parents and educators have more confidence in the educational environment. And perhaps most importantly, the processes become consistent and repeatable, not as a reaction to the latest wave of illness, but as a steady system running in the background, protecting everyone.

Back-to-school season is not just a reset, but a strategic opportunity. The investments schools make in prevention before that first bell rings ripple outward for the entire academic year. Small, consistent actions like hand hygiene routines, regular disinfection of high-touch surfaces, properly trained staff, and the right products in the right places add up to meaningful protection against germs and illness.

As you prepare for the coming school year, I encourage you to look at your cleaning protocols, your training cadence, and your product inventory with fresh eyes. Ask whether your custodial and teaching staff are equally equipped and informed. Consider whether electronic devices and teacher workspaces are part of your cleaning plan, and think about whether your current approach is reactive or truly proactive. The germs will show up on day one, but the question is whether you’re ready for them.