I have very little experience with tomato disease. I have Septoria which my plants always outgrow and it usually is just on the bottom leaves. I lost a few plants to Bacterial Rot Or Timber Rot one season when it rained a lot.
I hope someone else with more experience with disease answers your post. Years ago I had one plant that disease affected the new growth and I ended up pulling that plant. I waited a while but it did not get better. Since it is early and hopefully you have spare plants you might consider this.
Good Luck whatever you decide
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