If on Eradicator Epidemic Virus' activation, you have two cards on the field that it will destroy, then you can chain Starlight Road.
similar cards would be eradicator epidemic virus and deck devastation virus.
Lava Golem's Special Summon does not start a chain, so you cannot chain Epidemic Virus when it is tributing the monsters. You must use it before it would be Summoned or the intended target for Virus probably would not be there for it use.
If the opponent chooses Trap Cards for Eradicator Epidemic Virus (he chooses when EEV is activated) you can chain Fake Trap. When EEV resolves, only Fake Trap will be destroyed amongst your Trap Cards, however you have to reveal any set Trap Cards, but not Spell Cards.If the opponent picked Spell Cards, then you can't chain Fake Trap at all.
You can use it only in one specific situation: if you've got two face-up Spells or two face-up Traps, depending on the card type that your opponent declared. If you've got that, then you can chain Starlight Road to EEV. However say you had one face-up Spell/Trap and one face-down Spell/Trap; it would not be valid to use Starlight Road in this case under current rulings. (Starlight Road's specific wording is 'control' which means something you have on the field, so cards in hand don't count either even if they'd be destroyed).
yes
The epidemic was caused by a highly contagious virus.
The virus has hit epidemic proportions, in just two weeks.
Flu is always caused a virus, not bacteria, so no flu epidemic will be due to a bacterial agent. This is true of the 1918 "Spanish Flu", it was caused by a virus.
If Eradicator was chained to Grapha's eff targeting Ophion, then Eradicator will resolve first, tributing Ophion and destroying 1500 or less ATK monsters. Grapha's effect will then resolve. Since the intended target, Ophion, is not on the field anymore, Grapha's effect resolves with nothing happening.If Eradicator was chained to Gate's effect, then Eradictor will do its effect and since Grapha's effect will only activate after the card effect discarding it resolves, Grapha' effect will not activate. So after Eradictor and Gate resolve, Grapha will select a target, which can't be Ophion as it's no longer on the field and destroy it.
virus, epidemic, cold, the flu
The flu virus causes epidemics because so many people are infected at one time.
No. If it were that easy aids wouldn't be an epidemic in some countries.