You did a great job of establishing that the basis of the claim (viruses aren't real) is simply untrue and providing a source for that. It's informative and important especially when addressing potentially harmful misinformation such as viruses not existing and vaccines being a health risk. Additionally, you provide a second source to address the second part of this claim which is about vaccines, and how they don't provide any benefits which has been repeatedly proven untrue. In summary, you used great sources that provide factual and easy-to-understand information.