Some common sense guidelines are worth repeating: 1) If you are experiencing the effects of any potentially contagious illness, refrain from taking communion from the common chalice. 2) If you are coughing repeatedly and not feeling well, it is sensible to stay home and not attend Mass until you are well. 3) If you have a cough and runny nose (not allergies) it would be prudent to refrain from shaking hands.
Here is a recent guideline from the bishop's office:
With the guidance of the bishop it is the role of the pastor to judge whatever measures are needed to ensure the well-being of his parish community and to take every opportunity to remind the faithful that they should refrain from receiving Communion from the chalice if they are ill. The sick are not obliged to attend Mass and should use prudence and good judgment before coming into contact with others.