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Epidemiology and Public Health Career: What COVID Changed About the Field
Epidemiology and public health career guide: what epidemiologists actually do, how COVID reshaped the field and public perception, salary data, degree paths, and the career outlook post-2020.
Before 2020, most people couldn’t name a single epidemiologist. After 2020, phrases like “R naught,” “flattening the curve,” “herd immunity threshold,” and “case fatality rate” had entered everyday conversation. The COVID-19 pandemic accomplished something that decades of public health education couldn’t: it made epidemiology visible. For teenagers who watched the pandemic unfold and thought “I want to be the person who figures that out,” this represents a genuine career interest worth taking seriously and evaluating honestly.
Key Takeaways
- Epidemiology enrollment in graduate programs increased 40–60% at many schools post-2020; the cohort of people trained in these fields is substantially larger than it was before the pandemic
- Median salary for epidemiologists: $81,360 (BLS, 2024); public health workers more broadly earn $60,000–$100,000; senior epidemiologists at CDC, NIH, or major research universities earn $90,000–$160,000
- An MPH (Master of Public Health) is the standard professional credential for most public health careers; a PhD or MD/MPH is required for epidemiological research careers
- The CDC, state and local health departments, WHO, and international health organizations are the primary government employers; academic medical centers, consulting firms, pharmaceutical companies, and nonprofits also employ public health professionals
- Quantitative skills have become more important: epidemiology in 2026 requires proficiency in statistical software (R, SAS, STATA), data visualization, and increasingly machine learning for disease surveillance
What Epidemiologists Actually Do
The popular image from COVID: scientists briefing presidents, releasing dashboards, modeling disease trajectories, issuing guidance. The actual work is broader and often more local:
Outbreak Investigation: When a cluster of cases appears (foodborne illness, viral outbreak, occupational exposure), field epidemiologists investigate source, transmission, and affected population. They conduct case-control studies, traceback contaminated food sources, and implement control measures. CDC’s Epidemic Intelligence Service (EIS) is the training ground for the best field epidemiologists.
Disease Surveillance: Tracking disease patterns over time through systematic data collection. State health departments operate surveillance systems for dozens of reportable diseases. This involves data analysis, pattern detection, and reporting to federal databases.
Research Epidemiology: Academic and government epidemiologists design and conduct longitudinal studies, clinical trials, and observational research to understand disease etiology, risk factors, and interventions. This is the more academic side of the field.
Applied Public Health: Beyond epidemiology specifically, public health professionals work in maternal and child health, environmental health, health communication, health policy, and community health — broad application of population health principles.
Global Health: WHO, PAHO, MSF (Doctors Without Borders — employs MPH professionals), and international NGOs work on disease burden in lower-income countries, outbreak response, vaccination programs, and health systems strengthening.
The Degree Landscape
| Degree | Time | Career Access |
|---|---|---|
| BS in Public Health | 4 years | Entry-level public health roles, health education, outreach |
| MPH (Master of Public Health) | 2 years (+ BS) | Most professional public health roles; standard for health departments, nonprofits, agencies |
| MS in Epidemiology | 2 years (+ BS) | More quantitative; research settings |
| DrPH (Doctor of Public Health) | 3–5 years (+ master’s) | Leadership in public health practice |
| PhD in Epidemiology | 4–6 years (+ BS) | Academic research, senior government scientist |
| MD/MPH | 4 years medicine + 1–2 MPH | Physician-epidemiologist; highest compensation; clinical + research |
Top MPH programs by reputation and placement: Harvard T.H. Chan School of Public Health, Johns Hopkins Bloomberg School of Public Health, Columbia Mailman School, UC Berkeley School of Public Health, UNC Gillings School.
The Post-COVID Career Landscape
COVID genuinely changed public health careers in several ways:
Investment in public health infrastructure: The CARES Act, ARPA-H funding, and increased CDC appropriations have funded new positions, surveillance systems, and laboratories. This is real, though politically contested and subject to future budget cycles.
Workforce expansion: Many states and localities hired additional public health staff post-COVID. Some of this expansion is being sustained; some is contracting as emergency funding expires.
Political dimension: Public health became more politically contested during COVID. Public health officials faced harassment and threats in some jurisdictions. The career now involves navigating political dimensions in ways that were less common before 2020. This is worth knowing.
Data science integration: COVID surveillance required rapid data infrastructure development. Public health agencies are investing in data scientists, informaticists, and GIS specialists.
What to Watch For Over 3 Months
Watch CDC and state health department job postings. The actual positions posted, their required qualifications, and their salary ranges give a realistic picture of what the career path looks like in practice.
Observe your teen’s comfort with uncertainty and political complexity. Epidemiology deals with probabilistic statements, uncertainty, and the communication of what we don’t know as well as what we do. The COVID experience showed that communicating honest uncertainty is politically fraught. Teenagers who are comfortable with nuance and complexity are better suited to this career than those who want clear answers.
Look for volunteer opportunities with local health departments. Many state and local health departments have volunteer or internship programs. This is the most direct way to understand what the actual day-to-day work looks like before committing to a graduate education.
Frequently Asked Questions
Do you need a medical degree to be an epidemiologist?
No. Most epidemiologists have a master’s degree (MPH or MS in epidemiology) or a doctorate in public health or epidemiology. Physician-epidemiologists (MD/MPH) exist and are particularly valued for clinical research, but the majority of epidemiologists are not physicians.
What is the difference between an epidemiologist and a public health worker?
An epidemiologist specifically studies the distribution and determinants of disease in populations — using epidemiological study designs, statistical analysis, and surveillance data. Public health is the broader field; epidemiology is one specialty within it. Public health workers include health educators, environmental health scientists, health policy analysts, biostatisticians, and community health workers.
What happened to epidemiology enrollment after COVID?
Enrollment at major public health schools increased significantly — Harvard T.H. Chan reported a 40%+ increase in applications; Johns Hopkins similarly reported increased interest. The cohort of new public health graduates is substantially larger, which will increase competition for entry-level positions over the next several years.
Is epidemiology a good career for someone who wants to make a difference?
It can be. The COVID-19 pandemic, the opioid epidemic, HIV/AIDS response, and chronic disease prevention are all areas where epidemiological evidence directly informs policies that affect millions of people. The sense of mission is real. The honest constraint is that public health agencies are government-funded and politically contested, which affects both resources and the ability to implement evidence-based recommendations.
About the author
Ricky Flores is the founder of HiWave Makers and an electrical engineer with 15+ years of experience building consumer technology at Apple, Samsung, and Texas Instruments. He writes about how kids learn to build, think, and create in a tech-saturated world. Read more at hiwavemakers.com.
Sources
- Bureau of Labor Statistics. (2024). “Epidemiologists.” https://www.bls.gov/ooh/life-physical-and-social-science/epidemiologists.htm
- CDC Epidemic Intelligence Service. (2024). “EIS Program.” https://www.cdc.gov/eis/
- Association of Schools and Programs of Public Health. (2024). “Enrollment Trends in Public Health.” https://aspph.org/research/
- Johns Hopkins Bloomberg School of Public Health. (2024). “MPH Program.” https://publichealth.jhu.edu/offices-and-services/office-of-admissions/mph-program
- Harvard T.H. Chan School of Public Health. (2024). “Epidemiology Program.” https://www.hsph.harvard.edu/epidemiology/
- World Health Organization. (2024). “Global Public Health Workforce.” https://www.who.int/health-topics/health-workforce
