No, "infect" is a mechanic in the game that changes how damage is dealt by allowing creatures to deal damage in the form of poison counters instead of regular damage.
No, infect does not count as combat damage in Magic: The Gathering.
Infect is a replacement effect, meaning it modifies how the normal game rules work. Infect specifically modifies the damage-dealing rules. A creature with Infect does not deal regular damage to creatures or players. In the case of a creature, it places a -1/-1 counter on it for each point of unprevented damage. In the case of a player, it places that many Poison Counters. This is for combat damage and effect damage too. If a creature with Infect deals damage to a Planeswalker, as a Planeswalker is neither a creature nor a player, then the damage is handled normally. The Planewalker's own replacement effect will removes some of his or her loyalty counters.
HIV does not infect plants. It affects humans.
In Magic: The Gathering, infect damage is a type of damage that causes the player or creature to get poison counters instead of losing life points. When a player or creature with infect deals damage to another player or creature, that player or creature gets poison counters equal to the amount of infect damage dealt. If a player gets 10 or more poison counters, they lose the game.
Conficker only affects Microsoft's Windows operating system and so will not infect a Mac running Mac OS X.
No, 'Infect' is a replacement effect, ie, it does something 'instead' of what normally happens. A creature with Infect places -1/-1 counters instead of doing damage to creatures, and places Poison Counters instead of doing damage to players (it can hit a Planeswalker normally, no part of its replacement effect stops it).
malaria is an infectious disease. It affects mainly mammals but can also infect birds, reptiles, and other species. It can even infect plants.
Rabies causes inflammation of the brain in human
HIV does not infect the nervous system but affects it. Since HIV suppresses the immune system, pathogens can attack the nervous system. The virus does not directly attack the nerves.
In Magic: The Gathering, the Infect ability causes a player to get poison counters instead of losing life when they are dealt damage by a creature with Infect. If a player accumulates 10 or more poison counters, they lose the game.
"Chickenpox" (Varicella) affects males and females equally.
I think it affects the white blood cells first. But i am not very sure it is just a trial.