How do I italicize the word et al in apacite package

Question

I have the following MWE
documentclass[10pt,a4paper]{article}
usepackage{lipsum}
usepackage{filecontents}

begin{filecontents}{refere.bib}
    @article{k2016occurrence,
        author =        {K'oreje, KO and Vergeynst, Leendert and Ombaka, D and
            De Wispelaere, Patrick and Okoth, Maurice and
            Van Langenhove, Herman and Demeestere, Kristof},
        journal =       {Chemosphere},
        pages =         {238--244},
        publisher =     {Elsevier},
        title =         {Occurrence patterns of pharmaceutical residues in
            wastewater, surface water and groundwater of Nairobi
            and Kisumu city, Kenya},
        volume =        {149},
        year =          {2016},
    }
end{filecontents}
usepackage[natbibapa,apaciteclassic]{apacite}

author{author}
title{title}
begin{document}
maketitle
The corrections have been done as per the following chapters
section{Preamble Pages}
cite{k2016occurrence}

bibliographystyle{apacite}
bibliography{refere.bib}
end{document}

The LaTeX code runs but I want in the printed version the word et al to be italicized. I don't know how I can do this while still maintaining the use of package apacite. Any help would be appreciated thanks.

moewe · Accepted Answer

apacite uses macros to localise strings like "et al.", so you just have to redefine the relevant macros. This needs to happen in AtBeginDocument after apacite has done its language selection.
documentclass{article}
usepackage[natbibapa,apaciteclassic]{apacite}

AtBeginDocument[apacite-localisation]{%
  renewcommand{BOthers}[1]{emph{et al.}hbox{}}%
  renewcommand{BOthersPeriod}[1]{emph{et al.}hbox{}}%
}
DeclareHookRule{begindocument}{apacite-localisation}{after}{apacite}

begin{filecontents}{jobname.bib}
@article{k2016occurrence,
  author    = {K'oreje, KO and Vergeynst, Leendert and Ombaka, D
               and De Wispelaere, Patrick and Okoth, Maurice
               and Van Langenhove, Herman and Demeestere, Kristof},
  journal   = {Chemosphere},
  pages     = {238--244},
  publisher = {Elsevier},
  title     = {Occurrence Patterns of Pharmaceutical Residues in
               Wastewater, Surface Water and Groundwater of {Nairobi}
               and {Kisumu City}, {Kenya}},
  volume    = {149},
  year      = {2016},
}
end{filecontents}

begin{document}
cite{k2016occurrence}

bibliographystyle{apacite}
bibliography{jobname}
end{document}

If you are using a LaTeX version with the new hook management system (2020-10-01 or above), you may want to use a labelled AtBeginDocument hook with a rule to ensure proper execution order
usepackage[natbibapa,apaciteclassic]{apacite}

AtBeginDocument[apacite-localisation]{%
  renewcommand{BOthers}[1]{emph{et al.}hbox{}}%
  renewcommand{BOthersPeriod}[1]{emph{et al.}hbox{}}%
}
DeclareHookRule{begindocument}{apacite-localisation}{after}{apacite}

How do I italicize the word et al in apacite package

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