<Tr> <Td> Chicken pox </Td> <Td> 9 </Td> <Td> 21 </Td> <Td> days </Td> </Tr> <Tr> <Td> Cholera </Td> <Td> 0.5 </Td> <Td> 4.5 </Td> <Td> days </Td> </Tr> <Tr> <Td> Erythema infectiosum (Fifth disease) </Td> <Td> 13 </Td> <Td> 18 </Td> <Td> days </Td> </Tr> <Tr> <Td> Influenza </Td> <Td> </Td> <Td> </Td> <Td> days </Td> </Tr>

Which of the following types of disease has the shortest duration