Science Essay Examples: 13 Free Samples + PDF Download

Essay: Antibiotic Resistance and the Threat to Modern Medicine

[INTRO, Annotated]

Antibiotic resistance now causes an estimated 700,000 deaths per year globally, a number projected to reach 10 million by 2050 if current trends continue (World Health Organization, 2019). Antibiotics, drugs that kill or inhibit bacterial growth, have been a cornerstone of modern medicine since the introduction of penicillin in the 1940s. Their effectiveness, however, is being eroded by the spread of resistant bacterial strains, driven largely by overuse and misuse in both clinical and agricultural settings. This essay argues that reducing antibiotic resistance requires a coordinated approach combining prescribing reform, agricultural regulation, and accelerated development of alternative treatments.

What this intro does: Opens with a specific statistic that creates urgency, not a vague statement like "antibiotics are important." The definition of antibiotics appears early, which helps readers with less background. The final sentence is the thesis; it names three specific arguments the essay will make, which tells the reader exactly what's coming and what the writer is committing to prove.

[BODY PARAGRAPH 1: Annotated]

The most immediate driver of antibiotic resistance is overprescription in clinical settings. Studies estimate that approximately 30% of antibiotic prescriptions in the United States are unnecessary (Fleming-Dutra et al., 2016). When patients receive antibiotics for viral infections. against which antibiotics are ineffective, bacteria present in the body are unnecessarily exposed to the drug. This repeated exposure creates selection pressure: bacteria with genetic mutations that confer resistance survive, reproduce, and pass those traits on. Prescribing reform, including stricter guidelines and physician education programs, has been shown to reduce unnecessary prescriptions by up to 23% in pilot programs (Meeker et al., 2016).

What this paragraph does: Follows the PEEL structure, Point (overprescription), Evidence (30% figure), Explanation (how selection pressure works), Link (reform as solution). Notice that the citation appears directly after the claim it supports, not at the end of the paragraph. Every sentence has a job: none of them are filler.

[BODY PARAGRAPH 2: Annotated]

Agricultural use of antibiotic compounds exacerbates the clinical problem. An estimated 73% of global antibiotic consumption occurs in livestock farming, primarily as growth promoters rather than to treat disease (Van Boeckel et al., 2014). Resistant bacteria from animals can transfer to humans through direct contact, food consumption, or environmental pathways, including soil and water contamination. The European Union's 2006 ban on antibiotic growth promoters resulted in a measurable reduction in resistance rates in livestock, suggesting that regulatory intervention can produce meaningful outcomes (Grave et al., 2010).

What this paragraph does: Same structure as paragraph 1, each of the essay's three thesis points gets its own body paragraph. The evidence here is a real-world policy example, which shifts the paragraph from "here's the problem" to "here's proof a solution works." This is how evidence does more than just support a claim; it advances the argument.

[CONCLUSION: Annotated]

Antibiotic resistance is not an inevitable outcome; it is the consequence of specific, addressable practices in medicine and agriculture. The evidence reviewed here suggests that prescribing reform, tighter regulation of agricultural antibiotic use, and investment in alternative treatments each offer viable pathways to reducing resistance rates. Addressing any one of these factors in isolation is unlikely to be sufficient; a coordinated policy response across all three remains the most defensible approach given the available evidence.

What this conclusion does: No new information appears here, only a restatement of the thesis in different words and a synthesis of what the evidence showed. The final sentence doesn't overstate the findings ("this proves"), it uses measured language ("most defensible approach given the available evidence"), which is standard for scientific writing.