FIG. 4.

In vitro effects of the addition of antibody specific for viral E protein on DEN infection. U937 cells (A) or K562 cells (B) were infected with DEN-2 PL046 which had been preincubated with serially diluted MAb-containing ascitic fluid at 37°C for 60 min. Virus titers in the culture supernatants were determined at day 4 (for U937 cells) or day 6 (for K562 cells) p.i. Ab, antibody.