What does being “sick” mean?

If a human character’s health is reduced to zero as a result of a clash, he/she will become sick with the zombie virus. If a player becomes sick, he/she will have one day to track healthy diet and/or lifestyle items to recover some lost health or he/she will turn into a zombie the following day. Note that if the horde’s ferocity is at its maximum, human players may need to recover health AND escape the horde the following day in order to avoid being turned.