Final answer:
Sick patients, improperly sterilized equipment, and drug-resistant bacteria contribute to infections during healthcare.
Step-by-step explanation:
Several factors contribute to infections during healthcare. First, sick patients bring numerous pathogens into hospitals, which can be transmitted via improperly sterilized medical equipment, bed sheets, or by healthcare professionals who do not wash their hands. Second, many hospital patients have weakened immune systems, making them more susceptible to infections. Finally, the prevalence of antibiotics in hospitals can select for drug-resistant bacteria that can cause serious infections.