最近幾年因為SARS, 禽流感及豬流感, 讓人們對"葉金川的工作"有了些認識, 它就是公共衛生, 以往多數的人總是覺得學公衛不如學醫科, 若是以"Money"來說可能是如此, 但是以未來傳染病的全球化及複雜化的趨勢來看, 公衛人材的需求可能會大增.
公共衛生主要是研討幾個話題: 個人(慢性病或流行病)及集體環境衛生(社區/工廠廢棄物等), 個人衛生服務(老人/殘障人士), 健康研究, 醫療保健系統, 傳染病學, 健康管理(醫療管理)及職業病研究等. 在美國有許多數大學會將公衛編制在"研究所"科系, 但亦有些學校是放在大學部科系.
基本上, 它的出路其實頗寬廣的, 因為它涉及許多不同的醫療層面: 健康管理, 衛生服務, 護理, 微生物學, 營養學, 物理治療, 醫療助理, 公共管理等, 下面是它可能的出路:
| Ambulatory Services Specialist | Health Policy Practitioner | Planner & Program Analyst |
| Consultant | Industrial Hygienist | Program Director |
| Counselor | Investigator | Public Health Consultant |
| Dietician | Managed Care Coordinator | Public Health Nurse |
| Environmental Health Specialist | Medical Officer | Public Health Nutritionist |
| Epidemiologist | Medical Program Analyst | Research Assistant |
| Health and Safety Officer | Occupational Health Specialist | Residence Counselor |
| Health Center Administrator | Occupational Therapist | Social Worker |
| Health Educator | Outreach Worker | Supervisor of Medical Records |
| Health Officer | Physician | Training Coordinator/Director |
| Health Planner | Physician Assistant | |
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