Bacteriophages may have a lytic cycle or a lysogenic cycle. Transduction happens through either the lytic cycle or the lysogenic cycle. Upon infection, P22 can enter either a lytic or lysogenic growth pathway. The phage that causes lysis of the host is called a lytic or virulent phage. Lytic phages are more suitable for phage therapy. There are two main types of virus infection&colon; lytic and lysogenic. T4 is capable of undergoing only a lytic lifecycle and not the lysogenic lifecycle. During symptomatic infection, infected cells transcribe lytic viral genes. This is the key difference between the lytic and lysogenic (bacterio)phage cycles. They use this information to decide whether to enter a lytic or lysogenic life-cycle. ATL is frequently accompanied by visceral involvement, hypercalcemia, skin lesions, and lytic bone lesions. They are less likely than multiple myeloma patients to have lytic bone lesions. A virus following a lytic cycle is called a virulent virus. After induction, viral replication begins via the lytic cycle. This hypothesis is supported by lytic effects in vitro by plasmin.