Raskolnikov's illness supports his own theory in which he states that either illness or disease give rise to crime or crime is always accompanied by something akin to disease. Raskolnikov's state of illness, his psychotic desire to hold his bloody socks, his fever, and his delirium indicate the beginnings of his punishment.
Raskolnikov's attempt to reject the money again expresses his view that the Ubermensch (or extraordinary man or superior man) should not be obligated to anyone; he must be absolutely independent of everyone.
Zametov's visit and interest in Raskolnikov has absolutely nothing to do with his crime — instead, he is concerned about the complaints and summons that Raskolnikov's landlady has registered against him. The easy and affectionate way in which Razumihkin is able to handle Raskolnikov's landlady again emphasizes Raskolnikov's isolation and abnormality because of his failure to see with what ease he could have controlled her, thus obviating the summons from the police — a summons that ironically is served concurrent with the crime.
The recovery from the illness and the new clothes symbolically suggest that Raskolnikov will now begin his path towards recovery, redemption, and salvation.
