 Muscle aches and weakness also occur during this period and the affected person is unable to engage in physical activities.The KFD virus is a typical flavivirus measuring about 40-60 nm in diameter.The genome of KFDV consists of 10,774 nucleotides of single-stranded, positive-sense RNAencoding a single polyprotein that is cleaved post-translationally into three structural (C, prM/M and E) and seven non-structural (NS1, NS2a, NS2b, NS3, NS4a, NS4b and NS5) proteins.