What is the main challenge faced by biologists researching infectious diseases?

Well there alot of challenges faced by biologist researchers during the research of infectious disease, however major of those include the followings:1- Defining and measuring the fitness for pathogens across the scales2- Developing models to capture the impact of co-infection on the evolutionary process3- Modeling how pathogen characteristics shape the evolution of hose immune diversity4- Understanding the maintenance of pathogen diversity5- Developing the better models for the impact of genetic systems on pathogen evolution .
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-Payshence xoxo

They formed the oceans.  as they melted water was formed and the water made the oceans

Essential for a scientist to do for credibility

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.