The disease this spell causes is viral in nature, but isn't much worse than a really bad flu.

Cause Disease [17] 
    Innate Attack (Fatigue) 1 FP [6.875] 
        Fixed Delay (1 day) [+0%] 
        Malediction (Speed/Range Table) [+150%] 
        Based on Activation Roll [+5%] 
    Innate Attack (Fatigue) 1 FP [10.125] 
        Fixed Delay (1 day) [+0%] 
        Follow-Up [+150%] 
            This is a follow up to the first innate attack 
        Cyclic (18 daily cycles, Resistible, Highly contagious) [+140%] 
        Resistible (HT-5) [-5%] 
    Symptoms (ST-3 after 1/3 FP) [+45%] 
    Symptoms (ST-3 after 1/2 FP) [+30%] 
    Symptoms (ST-4 after 2/3 FP) [+15%] 
    Increased Immunity 4 [-40%] 
        Anyone that resists is permanently immune 
    Magical [-10%] 
    Spell Components [-20%] 
        Must say "disease" in Latin 
        Must gesture with hands