This thesis investigates a particular deviation of disinfection kinetics, known as Tailing phenomenon, that appears in case of the disinfection of Enterobacteria phage MS2 by Chlorine dioxide. Three hypotheses were tested: (1) Loss of biocidal properties of the experimental solution, (2) Aggregation of virus particles and (3) Existence of a resistant virus subpopulation. To verify Hypothesis 1 two differnet experiments were perfomed. First, the same amount of virus was added to the experimental solution in the time range when Tailing started. Second, Chlorite was added before starting. One run was conducted with a full dose and a second run with a half dose of Chlorite. To verify Hypothesis 2 beside disinfection experiments also Dynamic Light Scattering (DLS) measurements have been performed. The results of the DLS measurements showed no aggregate formation in the case of a standard disinfection experiment. Besides the physical - filtration, sonication before starting and in the time range of tailing - and chemical treatment of the experimental solution - Chloroform extraction, buffer with a higher Sodium chloride concentration - a lower virus concentration has also been used to influence the course of disinfection. To verfiy Hypothesis 3, two different experiments were performed. In both cases, a standard disinfection experiment was performed until the time range when Tailing started. In one case, the experimental solution was washed and then the experiment was restarted again. In the other case the concentration of the added Chlorine dioxide solution was increased. For all performed experiments the received disinfection curves possessed Tailing behaviour. Consequently all three proposed hypotheses had to be rejected. The results of Hypothesis 3 - especially for the experiment with a washing pause - constituted the starting point for further investigations that finally disclosed the tailing phenomenon.