There is no need to follow up. If the journalist is interested in using what you have sent, then they will respond to you. They have likely seen your email, so if you don't receive a reply, it's best to move onto the next enquiry.
You may get an email from the journalist when they are writing a story in the future. You can set up Google Alert with your name and company´s name, so you get an email when you are mentioned in the media. I hope this helps to clarify how to work with journalists.
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