Gram-negative cocci is

Neisseria is a gram-negative coccus typically arranged in pairs. Vibrio cholerae are gram-negative, curved bacilli. Campylobacter is gram-negative rods, typically comma-shaped. Helicobacter is a gram-negative spiral rod. Reference: Textbook of Microbiology; Anathanarayan and panicker's; 10th edition; Page no: 230