 Quartan fever is a form of malaria where an onset of fever occurs in an interval of three-four days, hence the name "quartan."
<fluency>  Quartan fever is a form of malaria where an onset of fever occurs in an interval of three-four days, hence the name "quartan."
 Quartan fever is a form of malaria where an onset of fever occurs in an interval of three to four days, hence the name "quartan."