New Ministry of Health guidelines are now limiting shuls, with the instructions of the Chief Rabbinate.

Among the new guidelines, shuls should have minyanim with more than 100 people.
If the shul has more than 100 people, they should break off into multiple minyanim in separate rooms or at different times.
The shul should be aired out and ventilated well at all times
The gabbaim of the shul should ensure proper hygiene and cleanliness kept all around the shul, and have disinfectant available
People mean to be in quarantine should NOT come to shul but should daven at home

for now schools and yeshivas should continue as normal and have not [yet] been instructed to close or decrease activity.

Weddings and simchas can continue as scheduled, but with a small number of guests (100 max)

Visiting the sick is an important mitzva but in the current situation with this highly contagious virus it should not be done. People should look for other ways to help those who are sick or in quarantine.

Regarding bris mila, as much as they have to be careful of these things all year round, the Rabbanut has said that the mohel should be extra careful now to ensure use of sterilized equipment, washing hands with a brush and soap, rinsing out his mouth with Listerine shortly before the bris itself. A mohel obligated in quarantine must follow the rules and not perform the bris - an alternate mohel should be found.