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I have managed a fully-remote team for 3.5 year. THIS IS DIFFERENT. Do not expect a team transitioning to remote-work to be fully effective right now. Kids are home, parents need extra care, infra is limited.
Many people do not have effective home setups. Supply chains may be strong, but the last-mile has limits and getting a home setup may be challenging.
If you are a people-manager, you should take this into account. If you have high-trust, you can discuss pandemic anxieties in 1:1s. Approve expenses for home-office setups. Not just the basics, but a few extras to reclaim "the normal" like office plants.
After a week of quarantine, our team recognized the pandemic was adding enough stress that we shifted to a 4-day week. There will be a lot of burnout from those still employed at the end of this. Better to shift gears now.
For those transitioning from in-office, it's worth explicitly defining new protocols. e.g. Turn your videos on. Use calendar invites. State your entire message in chat (instead of just "hey").
We use a team calendar to indicate when folks are/are-not around. It's self-hosted and no approval is required to add something. It helps answer the question of "busy or not here". If someone isn't away, but not responding that may be worth an extra check-in later.
For those not living alone, you need a discussion with your partner/roommates about work-protocol. When are you interrupt-able, and when are you not? My SO will text each other, so we can respond async.
Even given all that. Remember THIS IS NOT BUSINESS AS USUAL. This is not just "everyone working remotely". Engage your sympathy and empathy mental muscles.
Since this thread has picked up traction. I hope it's okay to plug a side-project I made to help deal with remoteness. It's a multiplayer realtime deck of cards. Casual use only. Possibly full of bugs 
https://cardhuddle.com/
https://cardhuddle.com/
I added some tactical advice for running remote teams here: https://twitter.com/0x604/status/1245353468006551554
