"Although the reported number of cases varies, arboviruses cause substantial morbidity in the United States each year. Cases occur sporadically, withepidemiology varying by virus and geography. Weather, zoonotic host, vector abundance, and human behavior all influence when and where arboviraloutbreaks occur, making it difficult to predict locations and timing of cases and underscoring the importance of surveillance in identifying outbreaks andinforming prevention efforts."Which of the following means the same as "Cases occur sporadically"?O Cases are caused by fungal spores.O Because of vector transmission, there is a steady rate of arboviral cases each yearO Outbreaks occur unpredictablyQUESTION 8"Although the reported number of cases varies, arboviruses cause substantial morbidity in the United States each year. Cases occur sporadically, withepidemiology varying by virus and geography. Weather, zoonotic host, vector abundance, and human behavior all influence when and where arboviraloutbreaks occur, making it difficult to predict locations and timing of cases and underscoring the importance of surveillance in identifying outbreaks andinforming prevention efforts."How would "zoonotic host" influence incidence of arboviral diseases?O The quote is suggesting that death rate is a consequence of which animal species is a reservoir for these arboviruses.O The zoonotic hosts must bite humans in order to transmit these arboviruses.O If there are fewer animals acting as reservoirs for these viruses, there may be fewer cases of arboviral disease.

Viruses are parasites that lack metabolic machinery.They enter the host cell and become metabolically active.Arboviruses are pathogenic to humans. One such type of virus causes encephalitis. These viruses are spread by arthropod vectors. The term "sporadically" means the spread of the infection at an irregular interval that cannot be predicted. Since the spread of the arboviral infection varies with geography, type of the virus, availability of vector population etc, its spread occurs at irregular intervals in an unpredictable manner. Answer: Outbreaks occur unpredictably.