Think of an apple. Now think of a knife cutting through the apple. The knife is separation. BOTH sides of the knife will experience the effects of separation. The knife will come between them and attack both of them. The inner and the outer will both suffer.
So sickness, as an implementation of the separation idea, isn't just happening to you. It's happening towards yourself and its happening towards others.
What applies to you applies equally to everyone else. That's the rule of the Holy Spirit's thought system, and the truth of how your mind works.
You cannot attack yourself without attacking others. You cannot separate yourself from the truth without pushing others away, which is an attack.
This is why Jesus explains that when we have sickness in the body, we are using sickness as an attack on our brother. The sick are always accusers. A sick body is a sign of an unhealed mind. And sickness is a device for separating you from everything else through attack upon yourself and others.
Death, as pathetically powerless as it seems to be, is the ultimate form of attack. It's not only an attempt to attack yourself so thoroughly that you completely separate from Life, but is also actually an attempt to attack Life - all life. Those who die are attempting to destroy all of creation. And they are attempting to destroy God. Their insistence that God is dead, which is a vicious attack, causes them to die.
So don't think of sickness as, one person has this sickness and another person doesn't. Sickness comes BETWEEN people. It is a separation device, a wall, a crow bar leveraged in-between what once was whole and joined and connected. It comes as a defense and as an attack. All defenses (against the truth or wholeness) are attacks.
So yes, everyone who is sick right now, is attacking not only themselves and God, but also everyone else. Anyone with a common cold is attempting to destroy themselves and others. This is why many supposed forms of sicknesses are contagious as well - an expression of the idea of attacking not only self but others also.
If you are sick it is because you have gone into isolation which means you have attempted to isolate yourself FROM others, but in so doing, also isolating OTHERS from you. Sickness is always a double-edged sword. It hurts you and it hurts everyone. It is applied to the whole sonship simultaneously.
It may seem in this world that for the most part, the sick are the only ones who suffer, or what can happen to them isn't happening to anyone else. But this isn't true. This is why a joining of minds with your brother can heal sickness because sickness is separation in the mind - separation between separate selves, who really are One.
Your sickness keeps you imprisoned and keeps everyone else imprisoned along with you. I'm not trying to make this a guilt-trip, but we need to recognize it for what it is so that we can be free of it. Self-attack is all-attack. Sickness is an attack on everyone.