An MPH degree is a very good major to study. With this specialty, you could work in hospitals or large pharmaceutical companies. You could also find a job in government agencies or you could teach or you could work as a consultant.
Apart from that, there are tons of private agencies that recruit epidemiologists.
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Now since you are curious about the scope of this particular degree, Public health is a concern in today's world with the rise in issues such as obesity, virus/flu and more. It serves to be one of the most reliable and consistent career without any doubt.
You can work for agencies or even well known hospitals. Most often you may not always get a high salary but of course with experience and work you will get there soon.
I must say that with the right mindset and will to do, you can definitely be the best at it and achieve quite a lot.
Have a great day ahead!