Escalating mortality rates attributed to drug-resistant Pseudomonas aeruginosa and the substantial complications arising from its infections present a global health crisis. Consequently, the need for innovative therapeutic approaches, notably immunogenic vaccines, has become imperative. Despite extensive research, it is still uncertain whether Pseudomonas aeruginosa immunization can effectively protect against acute and chronic infections. Additionally, the immune response triggered by this immunization is not strong enough against these bacteria. This study aims to devise a chimeric vaccine encompassing key virulence factors of P. aeruginosa that play roles in distinct infection phases. Moreover, these factors possess the capacity to interact with immune receptors, thereby enhancing innate and acquired immune reactions against this bacterium. In this investigation, an in-depth analysis of the P. aeruginosa profile informs the design of the antigenic chimeric structure named PAV3. This construct incorporates lectin, HIV TAT peptide, the N-terminal fragment of exotoxin A, and the Epi8 outer membrane protein F (OprF). Employing an immunoinformatic approach, B cell epitopes, HTL epitopes, CTL epitopes, and IFN-γ are predicted. The PAV3 construct is then expressed in E. coli strain BL21 and purified using affinity chromatography. Immunogenicity assessment of PAV3 entails measuring total IgG, IgG2a, and IgG1, along with specific cytokines (IFN-γ and IL-4) associated with Th1 and Th2 responses, respectively, in vaccinated BALB/c mice. Vaccination with the chimeric vaccine in BALB/c mice triggers a robust Th1 response characterized by elevated production of IgG2a and IFN-γ. This bodes well for inducing potent humoral and cellular immune responses, affording heightened protection. However, the introduction of alum adjuvant alongside PAV3 redirects the immune response toward Th2, leading to reduced protection against internal P. aeruginosa challenges compared to PAV3 alone. In summation, the designed vaccine elicits innate, humoral, and cellular immune responses, offering a promising strategy to manage host-P. aeruginosa interactions and surmount challenges associated with P. aeruginosa vaccination.